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Finding the Fourth Proportional to 91.81, 137.69 and 26.81

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Solution

The fourth proportional to 91.81, 137.69 and 26.81 is: 40.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.81 : 137.69 = 26.81 : x
  2. Step 2: Convert to fraction form
    91.81/137.69 = 26.81/x
  3. Step 3: Cross multiply
    91.81x = 137.69 × 26.81
  4. Step 4: Simplify right side
    91.81x = 3,691.47
  5. Step 5: Solve for x
    x = 3,691.47/91.81
  6. Step 6: Final answer
    x = 40.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.