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Finding the Fourth Proportional to 89.90, 135.04 and 88.48

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Solution

The fourth proportional to 89.90, 135.04 and 88.48 is: 132.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.90 : 135.04 = 88.48 : x
  2. Step 2: Convert to fraction form
    89.90/135.04 = 88.48/x
  3. Step 3: Cross multiply
    89.90x = 135.04 × 88.48
  4. Step 4: Simplify right side
    89.90x = 11,948.34
  5. Step 5: Solve for x
    x = 11,948.34/89.90
  6. Step 6: Final answer
    x = 132.91

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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.