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Finding the Fourth Proportional to 91.98, 137.73 and 71.55

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Solution

The fourth proportional to 91.98, 137.73 and 71.55 is: 107.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.98 : 137.73 = 71.55 : x
  2. Step 2: Convert to fraction form
    91.98/137.73 = 71.55/x
  3. Step 3: Cross multiply
    91.98x = 137.73 × 71.55
  4. Step 4: Simplify right side
    91.98x = 9,854.58
  5. Step 5: Solve for x
    x = 9,854.58/91.98
  6. Step 6: Final answer
    x = 107.14

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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.