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Finding the Fourth Proportional to 663,045.78, 915,006.90 and 387,419.82

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Solution

The fourth proportional to 663,045.78, 915,006.90 and 387,419.82 is: 534,641.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,045.78 : 915,006.90 = 387,419.82 : x
  2. Step 2: Convert to fraction form
    663,045.78/915,006.90 = 387,419.82/x
  3. Step 3: Cross multiply
    663,045.78x = 915,006.90 × 387,419.82
  4. Step 4: Simplify right side
    663,045.78x = 354,491,808,496.76
  5. Step 5: Solve for x
    x = 354,491,808,496.76/663,045.78
  6. Step 6: Final answer
    x = 534,641.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.