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Finding the Fourth Proportional to 91.68, 137.79 and 84.98

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Solution

The fourth proportional to 91.68, 137.79 and 84.98 is: 127.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.68 : 137.79 = 84.98 : x
  2. Step 2: Convert to fraction form
    91.68/137.79 = 84.98/x
  3. Step 3: Cross multiply
    91.68x = 137.79 × 84.98
  4. Step 4: Simplify right side
    91.68x = 11,708.71
  5. Step 5: Solve for x
    x = 11,708.71/91.68
  6. Step 6: Final answer
    x = 127.71

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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.