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Finding the Fourth Proportional to 91.94, 137.87 and 55.38

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Solution

The fourth proportional to 91.94, 137.87 and 55.38 is: 83.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.94 : 137.87 = 55.38 : x
  2. Step 2: Convert to fraction form
    91.94/137.87 = 55.38/x
  3. Step 3: Cross multiply
    91.94x = 137.87 × 55.38
  4. Step 4: Simplify right side
    91.94x = 7,635.69
  5. Step 5: Solve for x
    x = 7,635.69/91.94
  6. Step 6: Final answer
    x = 83.06

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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.