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Finding the Fourth Proportional to 91.87, 137.68 and 50.69

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Solution

The fourth proportional to 91.87, 137.68 and 50.69 is: 75.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.87 : 137.68 = 50.69 : x
  2. Step 2: Convert to fraction form
    91.87/137.68 = 50.69/x
  3. Step 3: Cross multiply
    91.87x = 137.68 × 50.69
  4. Step 4: Simplify right side
    91.87x = 6,979.00
  5. Step 5: Solve for x
    x = 6,979.00/91.87
  6. Step 6: Final answer
    x = 75.97

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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.