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Finding the Fourth Proportional to 139.68, 191.88 and 125.16

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Solution

The fourth proportional to 139.68, 191.88 and 125.16 is: 171.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.68 : 191.88 = 125.16 : x
  2. Step 2: Convert to fraction form
    139.68/191.88 = 125.16/x
  3. Step 3: Cross multiply
    139.68x = 191.88 × 125.16
  4. Step 4: Simplify right side
    139.68x = 24,015.70
  5. Step 5: Solve for x
    x = 24,015.70/139.68
  6. Step 6: Final answer
    x = 171.93

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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.