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Finding the Fourth Proportional to 91.68, 137.36 and 88.80

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Solution

The fourth proportional to 91.68, 137.36 and 88.80 is: 133.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.68 : 137.36 = 88.80 : x
  2. Step 2: Convert to fraction form
    91.68/137.36 = 88.80/x
  3. Step 3: Cross multiply
    91.68x = 137.36 × 88.80
  4. Step 4: Simplify right side
    91.68x = 12,197.57
  5. Step 5: Solve for x
    x = 12,197.57/91.68
  6. Step 6: Final answer
    x = 133.05

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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.