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Finding the Fourth Proportional to 715.56, 992.49 and 686.40

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Solution

The fourth proportional to 715.56, 992.49 and 686.40 is: 952.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.56 : 992.49 = 686.40 : x
  2. Step 2: Convert to fraction form
    715.56/992.49 = 686.40/x
  3. Step 3: Cross multiply
    715.56x = 992.49 × 686.40
  4. Step 4: Simplify right side
    715.56x = 681,245.14
  5. Step 5: Solve for x
    x = 681,245.14/715.56
  6. Step 6: Final answer
    x = 952.04

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.