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Finding the Fourth Proportional to 90.74, 136.25 and 88.44

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Solution

The fourth proportional to 90.74, 136.25 and 88.44 is: 132.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.74 : 136.25 = 88.44 : x
  2. Step 2: Convert to fraction form
    90.74/136.25 = 88.44/x
  3. Step 3: Cross multiply
    90.74x = 136.25 × 88.44
  4. Step 4: Simplify right side
    90.74x = 12,049.51
  5. Step 5: Solve for x
    x = 12,049.51/90.74
  6. Step 6: Final answer
    x = 132.79

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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.