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Finding the Fourth Proportional to 91.87, 136.63 and 88.99

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Solution

The fourth proportional to 91.87, 136.63 and 88.99 is: 132.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.87 : 136.63 = 88.99 : x
  2. Step 2: Convert to fraction form
    91.87/136.63 = 88.99/x
  3. Step 3: Cross multiply
    91.87x = 136.63 × 88.99
  4. Step 4: Simplify right side
    91.87x = 12,158.14
  5. Step 5: Solve for x
    x = 12,158.14/91.87
  6. Step 6: Final answer
    x = 132.34

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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.