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Finding the Fourth Proportional to 715,638.29, 987,606.81 and 393,372.90

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Solution

The fourth proportional to 715,638.29, 987,606.81 and 393,372.90 is: 542,868.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,638.29 : 987,606.81 = 393,372.90 : x
  2. Step 2: Convert to fraction form
    715,638.29/987,606.81 = 393,372.90/x
  3. Step 3: Cross multiply
    715,638.29x = 987,606.81 × 393,372.90
  4. Step 4: Simplify right side
    715,638.29x = 388,497,754,909.45
  5. Step 5: Solve for x
    x = 388,497,754,909.45/715,638.29
  6. Step 6: Final answer
    x = 542,868.88

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1.5x scale

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.