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Finding the Fourth Proportional to 90.88, 135.33 and 89.87

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Solution

The fourth proportional to 90.88, 135.33 and 89.87 is: 133.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.88 : 135.33 = 89.87 : x
  2. Step 2: Convert to fraction form
    90.88/135.33 = 89.87/x
  3. Step 3: Cross multiply
    90.88x = 135.33 × 89.87
  4. Step 4: Simplify right side
    90.88x = 12,162.11
  5. Step 5: Solve for x
    x = 12,162.11/90.88
  6. Step 6: Final answer
    x = 133.83

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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.