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Finding the Fourth Proportional to 724.87, 1,087.41 and 359.68

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Solution

The fourth proportional to 724.87, 1,087.41 and 359.68 is: 539.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.87 : 1,087.41 = 359.68 : x
  2. Step 2: Convert to fraction form
    724.87/1,087.41 = 359.68/x
  3. Step 3: Cross multiply
    724.87x = 1,087.41 × 359.68
  4. Step 4: Simplify right side
    724.87x = 391,119.63
  5. Step 5: Solve for x
    x = 391,119.63/724.87
  6. Step 6: Final answer
    x = 539.57

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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.