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Finding the Fourth Proportional to 91.90, 137.12 and 88.66

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Solution

The fourth proportional to 91.90, 137.12 and 88.66 is: 132.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.90 : 137.12 = 88.66 : x
  2. Step 2: Convert to fraction form
    91.90/137.12 = 88.66/x
  3. Step 3: Cross multiply
    91.90x = 137.12 × 88.66
  4. Step 4: Simplify right side
    91.90x = 12,157.06
  5. Step 5: Solve for x
    x = 12,157.06/91.90
  6. Step 6: Final answer
    x = 132.29

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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.