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Finding the Fourth Proportional to 88.43, 131.90 and 74.88

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Solution

The fourth proportional to 88.43, 131.90 and 74.88 is: 111.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.43 : 131.90 = 74.88 : x
  2. Step 2: Convert to fraction form
    88.43/131.90 = 74.88/x
  3. Step 3: Cross multiply
    88.43x = 131.90 × 74.88
  4. Step 4: Simplify right side
    88.43x = 9,876.30
  5. Step 5: Solve for x
    x = 9,876.30/88.43
  6. Step 6: Final answer
    x = 111.69

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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.