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Finding the Fourth Proportional to 91.88, 125.20 and 91.56

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Solution

The fourth proportional to 91.88, 125.20 and 91.56 is: 124.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.88 : 125.20 = 91.56 : x
  2. Step 2: Convert to fraction form
    91.88/125.20 = 91.56/x
  3. Step 3: Cross multiply
    91.88x = 125.20 × 91.56
  4. Step 4: Simplify right side
    91.88x = 11,463.31
  5. Step 5: Solve for x
    x = 11,463.31/91.88
  6. Step 6: Final answer
    x = 124.76

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.