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Finding the Fourth Proportional to 139.44, 191.40 and 124.86

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Solution

The fourth proportional to 139.44, 191.40 and 124.86 is: 171.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.44 : 191.40 = 124.86 : x
  2. Step 2: Convert to fraction form
    139.44/191.40 = 124.86/x
  3. Step 3: Cross multiply
    139.44x = 191.40 × 124.86
  4. Step 4: Simplify right side
    139.44x = 23,898.20
  5. Step 5: Solve for x
    x = 23,898.20/139.44
  6. Step 6: Final answer
    x = 171.39

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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.