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Finding the Fourth Proportional to 724.92, 1,087.32 and 359.64

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Solution

The fourth proportional to 724.92, 1,087.32 and 359.64 is: 539.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.92 : 1,087.32 = 359.64 : x
  2. Step 2: Convert to fraction form
    724.92/1,087.32 = 359.64/x
  3. Step 3: Cross multiply
    724.92x = 1,087.32 × 359.64
  4. Step 4: Simplify right side
    724.92x = 391,043.76
  5. Step 5: Solve for x
    x = 391,043.76/724.92
  6. Step 6: Final answer
    x = 539.43

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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.