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Finding the Fourth Proportional to 715,517.28, 987,437.52 and 393,238.80

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Solution

The fourth proportional to 715,517.28, 987,437.52 and 393,238.80 is: 542,682.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,517.28 : 987,437.52 = 393,238.80 : x
  2. Step 2: Convert to fraction form
    715,517.28/987,437.52 = 393,238.80/x
  3. Step 3: Cross multiply
    715,517.28x = 987,437.52 × 393,238.80
  4. Step 4: Simplify right side
    715,517.28x = 388,298,745,439.78
  5. Step 5: Solve for x
    x = 388,298,745,439.78/715,517.28
  6. Step 6: Final answer
    x = 542,682.55

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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.