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Finding the Fourth Proportional to 724.37, 1,087.78 and 687.38

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Solution

The fourth proportional to 724.37, 1,087.78 and 687.38 is: 1,032.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.37 : 1,087.78 = 687.38 : x
  2. Step 2: Convert to fraction form
    724.37/1,087.78 = 687.38/x
  3. Step 3: Cross multiply
    724.37x = 1,087.78 × 687.38
  4. Step 4: Simplify right side
    724.37x = 747,718.22
  5. Step 5: Solve for x
    x = 747,718.22/724.37
  6. Step 6: Final answer
    x = 1,032.23

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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.