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Finding the Fourth Proportional to 431,390.10, 647,085.15 and 274,314.90

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Solution

The fourth proportional to 431,390.10, 647,085.15 and 274,314.90 is: 411,472.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,390.10 : 647,085.15 = 274,314.90 : x
  2. Step 2: Convert to fraction form
    431,390.10/647,085.15 = 274,314.90/x
  3. Step 3: Cross multiply
    431,390.10x = 647,085.15 × 274,314.90
  4. Step 4: Simplify right side
    431,390.10x = 177,505,098,213.74
  5. Step 5: Solve for x
    x = 177,505,098,213.74/431,390.10
  6. Step 6: Final answer
    x = 411,472.35

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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.