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Finding the Fourth Proportional to 128.88, 176.90 and 124.56

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Solution

The fourth proportional to 128.88, 176.90 and 124.56 is: 170.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.88 : 176.90 = 124.56 : x
  2. Step 2: Convert to fraction form
    128.88/176.90 = 124.56/x
  3. Step 3: Cross multiply
    128.88x = 176.90 × 124.56
  4. Step 4: Simplify right side
    128.88x = 22,034.66
  5. Step 5: Solve for x
    x = 22,034.66/128.88
  6. Step 6: Final answer
    x = 170.97

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.