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Finding the Fourth Proportional to 112.79, 169.80 and 88.54

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Solution

The fourth proportional to 112.79, 169.80 and 88.54 is: 133.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.79 : 169.80 = 88.54 : x
  2. Step 2: Convert to fraction form
    112.79/169.80 = 88.54/x
  3. Step 3: Cross multiply
    112.79x = 169.80 × 88.54
  4. Step 4: Simplify right side
    112.79x = 15,034.09
  5. Step 5: Solve for x
    x = 15,034.09/112.79
  6. Step 6: Final answer
    x = 133.29

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.