Home / 644,435,998.60-966,653,997.90-399,547,985.80

Finding the Fourth Proportional to 644,435,998.60, 966,653,997.90 and 399,547,985.80

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Solution

The fourth proportional to 644,435,998.60, 966,653,997.90 and 399,547,985.80 is: 599,321,978.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,435,998.60 : 966,653,997.90 = 399,547,985.80 : x
  2. Step 2: Convert to fraction form
    644,435,998.60/966,653,997.90 = 399,547,985.80/x
  3. Step 3: Cross multiply
    644,435,998.60x = 966,653,997.90 × 399,547,985.80
  4. Step 4: Simplify right side
    644,435,998.60x = 386,224,657,826,462,400
  5. Step 5: Solve for x
    x = 386,224,657,826,462,400/644,435,998.60
  6. Step 6: Final answer
    x = 599,321,978.70

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.