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Finding the Fourth Proportional to 139.44, 191.45 and 123.15

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Solution

The fourth proportional to 139.44, 191.45 and 123.15 is: 169.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.44 : 191.45 = 123.15 : x
  2. Step 2: Convert to fraction form
    139.44/191.45 = 123.15/x
  3. Step 3: Cross multiply
    139.44x = 191.45 × 123.15
  4. Step 4: Simplify right side
    139.44x = 23,576.45
  5. Step 5: Solve for x
    x = 23,576.45/139.44
  6. Step 6: Final answer
    x = 169.08

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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.