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Finding the Fourth Proportional to 91.97, 137.75 and 74.77

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Solution

The fourth proportional to 91.97, 137.75 and 74.77 is: 111.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.97 : 137.75 = 74.77 : x
  2. Step 2: Convert to fraction form
    91.97/137.75 = 74.77/x
  3. Step 3: Cross multiply
    91.97x = 137.75 × 74.77
  4. Step 4: Simplify right side
    91.97x = 10,298.85
  5. Step 5: Solve for x
    x = 10,298.85/91.97
  6. Step 6: Final answer
    x = 111.98

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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.