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Finding the Fourth Proportional to 715, 1,073.22 and 520.60

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Solution

The fourth proportional to 715, 1,073.22 and 520.60 is: 781.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    715 : 1,073.22 = 520.60 : x
  2. Step 2: Convert to fraction form
    715/1,073.22 = 520.60/x
  3. Step 3: Cross multiply
    715x = 1,073.22 × 520.60
  4. Step 4: Simplify right side
    715x = 558,718.33
  5. Step 5: Solve for x
    x = 558,718.33/715
  6. Step 6: Final answer
    x = 781.42

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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.