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Finding the Fourth Proportional to 725.55, 1,088.78 and 560.38

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Solution

The fourth proportional to 725.55, 1,088.78 and 560.38 is: 840.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.55 : 1,088.78 = 560.38 : x
  2. Step 2: Convert to fraction form
    725.55/1,088.78 = 560.38/x
  3. Step 3: Cross multiply
    725.55x = 1,088.78 × 560.38
  4. Step 4: Simplify right side
    725.55x = 610,125.01
  5. Step 5: Solve for x
    x = 610,125.01/725.55
  6. Step 6: Final answer
    x = 840.91

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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.