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Finding the Fourth Proportional to 91.72, 138.13 and 82.69

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Solution

The fourth proportional to 91.72, 138.13 and 82.69 is: 124.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.72 : 138.13 = 82.69 : x
  2. Step 2: Convert to fraction form
    91.72/138.13 = 82.69/x
  3. Step 3: Cross multiply
    91.72x = 138.13 × 82.69
  4. Step 4: Simplify right side
    91.72x = 11,421.42
  5. Step 5: Solve for x
    x = 11,421.42/91.72
  6. Step 6: Final answer
    x = 124.52

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.