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Finding the Fourth Proportional to 91.47, 126.20 and 77.66

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Solution

The fourth proportional to 91.47, 126.20 and 77.66 is: 107.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.47 : 126.20 = 77.66 : x
  2. Step 2: Convert to fraction form
    91.47/126.20 = 77.66/x
  3. Step 3: Cross multiply
    91.47x = 126.20 × 77.66
  4. Step 4: Simplify right side
    91.47x = 9,799.67
  5. Step 5: Solve for x
    x = 9,799.67/91.47
  6. Step 6: Final answer
    x = 107.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.