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Finding the Fourth Proportional to 724.87, 1,086.22 and 359.90

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Solution

The fourth proportional to 724.87, 1,086.22 and 359.90 is: 539.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.87 : 1,086.22 = 359.90 : x
  2. Step 2: Convert to fraction form
    724.87/1,086.22 = 359.90/x
  3. Step 3: Cross multiply
    724.87x = 1,086.22 × 359.90
  4. Step 4: Simplify right side
    724.87x = 390,930.58
  5. Step 5: Solve for x
    x = 390,930.58/724.87
  6. Step 6: Final answer
    x = 539.31

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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.