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Finding the Fourth Proportional to 91, 125.17 and 80.07

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Solution

The fourth proportional to 91, 125.17 and 80.07 is: 110.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    91 : 125.17 = 80.07 : x
  2. Step 2: Convert to fraction form
    91/125.17 = 80.07/x
  3. Step 3: Cross multiply
    91x = 125.17 × 80.07
  4. Step 4: Simplify right side
    91x = 10,022.36
  5. Step 5: Solve for x
    x = 10,022.36/91
  6. Step 6: Final answer
    x = 110.14

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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.