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Finding the Fourth Proportional to 438,403.80, 656,439.30 and 279,773.40

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Solution

The fourth proportional to 438,403.80, 656,439.30 and 279,773.40 is: 418,915.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,403.80 : 656,439.30 = 279,773.40 : x
  2. Step 2: Convert to fraction form
    438,403.80/656,439.30 = 279,773.40/x
  3. Step 3: Cross multiply
    438,403.80x = 656,439.30 × 279,773.40
  4. Step 4: Simplify right side
    438,403.80x = 183,654,254,854.62
  5. Step 5: Solve for x
    x = 183,654,254,854.62/438,403.80
  6. Step 6: Final answer
    x = 418,915.75

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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.