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Finding the Fourth Proportional to 91.01, 125.68 and 86.92

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Solution

The fourth proportional to 91.01, 125.68 and 86.92 is: 120.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.01 : 125.68 = 86.92 : x
  2. Step 2: Convert to fraction form
    91.01/125.68 = 86.92/x
  3. Step 3: Cross multiply
    91.01x = 125.68 × 86.92
  4. Step 4: Simplify right side
    91.01x = 10,924.11
  5. Step 5: Solve for x
    x = 10,924.11/91.01
  6. Step 6: Final answer
    x = 120.03

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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.