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Finding the Fourth Proportional to 91.66, 137.58 and 86.89

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Solution

The fourth proportional to 91.66, 137.58 and 86.89 is: 130.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.66 : 137.58 = 86.89 : x
  2. Step 2: Convert to fraction form
    91.66/137.58 = 86.89/x
  3. Step 3: Cross multiply
    91.66x = 137.58 × 86.89
  4. Step 4: Simplify right side
    91.66x = 11,954.33
  5. Step 5: Solve for x
    x = 11,954.33/91.66
  6. Step 6: Final answer
    x = 130.42

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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.