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Finding the Fourth Proportional to 128.44, 191.35 and 124.09

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Solution

The fourth proportional to 128.44, 191.35 and 124.09 is: 184.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.44 : 191.35 = 124.09 : x
  2. Step 2: Convert to fraction form
    128.44/191.35 = 124.09/x
  3. Step 3: Cross multiply
    128.44x = 191.35 × 124.09
  4. Step 4: Simplify right side
    128.44x = 23,744.62
  5. Step 5: Solve for x
    x = 23,744.62/128.44
  6. Step 6: Final answer
    x = 184.87

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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.