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Finding the Fourth Proportional to 91.73, 136.89 and 81.51

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Solution

The fourth proportional to 91.73, 136.89 and 81.51 is: 121.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.73 : 136.89 = 81.51 : x
  2. Step 2: Convert to fraction form
    91.73/136.89 = 81.51/x
  3. Step 3: Cross multiply
    91.73x = 136.89 × 81.51
  4. Step 4: Simplify right side
    91.73x = 11,157.39
  5. Step 5: Solve for x
    x = 11,157.39/91.73
  6. Step 6: Final answer
    x = 121.63

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.