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Finding the Fourth Proportional to 90.88, 135.56 and 88.96

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Solution

The fourth proportional to 90.88, 135.56 and 88.96 is: 132.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.88 : 135.56 = 88.96 : x
  2. Step 2: Convert to fraction form
    90.88/135.56 = 88.96/x
  3. Step 3: Cross multiply
    90.88x = 135.56 × 88.96
  4. Step 4: Simplify right side
    90.88x = 12,059.42
  5. Step 5: Solve for x
    x = 12,059.42/90.88
  6. Step 6: Final answer
    x = 132.70

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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.