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Finding the Fourth Proportional to 91.38, 125.01 and 90.99

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Solution

The fourth proportional to 91.38, 125.01 and 90.99 is: 124.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.38 : 125.01 = 90.99 : x
  2. Step 2: Convert to fraction form
    91.38/125.01 = 90.99/x
  3. Step 3: Cross multiply
    91.38x = 125.01 × 90.99
  4. Step 4: Simplify right side
    91.38x = 11,374.66
  5. Step 5: Solve for x
    x = 11,374.66/91.38
  6. Step 6: Final answer
    x = 124.48

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.