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Finding the Fourth Proportional to 91.38, 125.73 and 85.62

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Solution

The fourth proportional to 91.38, 125.73 and 85.62 is: 117.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.38 : 125.73 = 85.62 : x
  2. Step 2: Convert to fraction form
    91.38/125.73 = 85.62/x
  3. Step 3: Cross multiply
    91.38x = 125.73 × 85.62
  4. Step 4: Simplify right side
    91.38x = 10,765.00
  5. Step 5: Solve for x
    x = 10,765.00/91.38
  6. Step 6: Final answer
    x = 117.80

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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.