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Finding the Fourth Proportional to 90.74, 135.24 and 88.94

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Solution

The fourth proportional to 90.74, 135.24 and 88.94 is: 132.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.74 : 135.24 = 88.94 : x
  2. Step 2: Convert to fraction form
    90.74/135.24 = 88.94/x
  3. Step 3: Cross multiply
    90.74x = 135.24 × 88.94
  4. Step 4: Simplify right side
    90.74x = 12,028.25
  5. Step 5: Solve for x
    x = 12,028.25/90.74
  6. Step 6: Final answer
    x = 132.56

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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.