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Finding the Fourth Proportional to 82.72, 123.96 and 66.52

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Solution

The fourth proportional to 82.72, 123.96 and 66.52 is: 99.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.72 : 123.96 = 66.52 : x
  2. Step 2: Convert to fraction form
    82.72/123.96 = 66.52/x
  3. Step 3: Cross multiply
    82.72x = 123.96 × 66.52
  4. Step 4: Simplify right side
    82.72x = 8,245.82
  5. Step 5: Solve for x
    x = 8,245.82/82.72
  6. Step 6: Final answer
    x = 99.68

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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.