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Finding the Fourth Proportional to 139.18, 191.99 and 80.93

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Solution

The fourth proportional to 139.18, 191.99 and 80.93 is: 111.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.18 : 191.99 = 80.93 : x
  2. Step 2: Convert to fraction form
    139.18/191.99 = 80.93/x
  3. Step 3: Cross multiply
    139.18x = 191.99 × 80.93
  4. Step 4: Simplify right side
    139.18x = 15,536.79
  5. Step 5: Solve for x
    x = 15,536.79/139.18
  6. Step 6: Final answer
    x = 111.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.