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Finding the Fourth Proportional to 725.72, 1,087.36 and 519.24

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Solution

The fourth proportional to 725.72, 1,087.36 and 519.24 is: 777.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.72 : 1,087.36 = 519.24 : x
  2. Step 2: Convert to fraction form
    725.72/1,087.36 = 519.24/x
  3. Step 3: Cross multiply
    725.72x = 1,087.36 × 519.24
  4. Step 4: Simplify right side
    725.72x = 564,600.81
  5. Step 5: Solve for x
    x = 564,600.81/725.72
  6. Step 6: Final answer
    x = 777.99

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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.