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Finding the Fourth Proportional to 91.13, 125.65 and 74.72

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Solution

The fourth proportional to 91.13, 125.65 and 74.72 is: 103.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.13 : 125.65 = 74.72 : x
  2. Step 2: Convert to fraction form
    91.13/125.65 = 74.72/x
  3. Step 3: Cross multiply
    91.13x = 125.65 × 74.72
  4. Step 4: Simplify right side
    91.13x = 9,388.98
  5. Step 5: Solve for x
    x = 9,388.98/91.13
  6. Step 6: Final answer
    x = 103.03

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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.