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Finding the Fourth Proportional to 128.81, 194.39 and 124.52

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Solution

The fourth proportional to 128.81, 194.39 and 124.52 is: 187.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.81 : 194.39 = 124.52 : x
  2. Step 2: Convert to fraction form
    128.81/194.39 = 124.52/x
  3. Step 3: Cross multiply
    128.81x = 194.39 × 124.52
  4. Step 4: Simplify right side
    128.81x = 24,203.85
  5. Step 5: Solve for x
    x = 24,203.85/128.81
  6. Step 6: Final answer
    x = 187.91

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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.