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Finding the Fourth Proportional to 724.80, 1,087.38 and 237.90

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Solution

The fourth proportional to 724.80, 1,087.38 and 237.90 is: 356.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.80 : 1,087.38 = 237.90 : x
  2. Step 2: Convert to fraction form
    724.80/1,087.38 = 237.90/x
  3. Step 3: Cross multiply
    724.80x = 1,087.38 × 237.90
  4. Step 4: Simplify right side
    724.80x = 258,687.70
  5. Step 5: Solve for x
    x = 258,687.70/724.80
  6. Step 6: Final answer
    x = 356.91

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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.