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Finding the Fourth Proportional to 427,998.80, 641,998.20 and 218,046.80

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Solution

The fourth proportional to 427,998.80, 641,998.20 and 218,046.80 is: 327,070.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,998.80 : 641,998.20 = 218,046.80 : x
  2. Step 2: Convert to fraction form
    427,998.80/641,998.20 = 218,046.80/x
  3. Step 3: Cross multiply
    427,998.80x = 641,998.20 × 218,046.80
  4. Step 4: Simplify right side
    427,998.80x = 139,985,653,115.76
  5. Step 5: Solve for x
    x = 139,985,653,115.76/427,998.80
  6. Step 6: Final answer
    x = 327,070.20

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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.