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Finding the Fourth Proportional to 721.26, 1,079.85 and 560.82

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Solution

The fourth proportional to 721.26, 1,079.85 and 560.82 is: 839.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.26 : 1,079.85 = 560.82 : x
  2. Step 2: Convert to fraction form
    721.26/1,079.85 = 560.82/x
  3. Step 3: Cross multiply
    721.26x = 1,079.85 × 560.82
  4. Step 4: Simplify right side
    721.26x = 605,601.48
  5. Step 5: Solve for x
    x = 605,601.48/721.26
  6. Step 6: Final answer
    x = 839.64

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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.