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Finding the Fourth Proportional to 91.98, 137.07 and 91.17

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Solution

The fourth proportional to 91.98, 137.07 and 91.17 is: 135.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.98 : 137.07 = 91.17 : x
  2. Step 2: Convert to fraction form
    91.98/137.07 = 91.17/x
  3. Step 3: Cross multiply
    91.98x = 137.07 × 91.17
  4. Step 4: Simplify right side
    91.98x = 12,496.67
  5. Step 5: Solve for x
    x = 12,496.67/91.98
  6. Step 6: Final answer
    x = 135.86

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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.