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Finding the Fourth Proportional to 715,257.42, 987,061.92 and 392,974.20

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Solution

The fourth proportional to 715,257.42, 987,061.92 and 392,974.20 is: 542,308.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,257.42 : 987,061.92 = 392,974.20 : x
  2. Step 2: Convert to fraction form
    715,257.42/987,061.92 = 392,974.20/x
  3. Step 3: Cross multiply
    715,257.42x = 987,061.92 × 392,974.20
  4. Step 4: Simplify right side
    715,257.42x = 387,889,868,362.46
  5. Step 5: Solve for x
    x = 387,889,868,362.46/715,257.42
  6. Step 6: Final answer
    x = 542,308.07

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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.