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Finding the Fourth Proportional to 139.32, 191.97 and 113.00

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Solution

The fourth proportional to 139.32, 191.97 and 113.00 is: 155.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.32 : 191.97 = 113.00 : x
  2. Step 2: Convert to fraction form
    139.32/191.97 = 113.00/x
  3. Step 3: Cross multiply
    139.32x = 191.97 × 113.00
  4. Step 4: Simplify right side
    139.32x = 21,691.65
  5. Step 5: Solve for x
    x = 21,691.65/139.32
  6. Step 6: Final answer
    x = 155.70

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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.