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Finding the Fourth Proportional to 485,666.60, 728,499.90 and 438,427.40

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Solution

The fourth proportional to 485,666.60, 728,499.90 and 438,427.40 is: 657,641.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,666.60 : 728,499.90 = 438,427.40 : x
  2. Step 2: Convert to fraction form
    485,666.60/728,499.90 = 438,427.40/x
  3. Step 3: Cross multiply
    485,666.60x = 728,499.90 × 438,427.40
  4. Step 4: Simplify right side
    485,666.60x = 319,394,317,057.26
  5. Step 5: Solve for x
    x = 319,394,317,057.26/485,666.60
  6. Step 6: Final answer
    x = 657,641.10

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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.