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Finding the Fourth Proportional to 139.12, 191.34 and 114.04

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Solution

The fourth proportional to 139.12, 191.34 and 114.04 is: 156.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.12 : 191.34 = 114.04 : x
  2. Step 2: Convert to fraction form
    139.12/191.34 = 114.04/x
  3. Step 3: Cross multiply
    139.12x = 191.34 × 114.04
  4. Step 4: Simplify right side
    139.12x = 21,820.22
  5. Step 5: Solve for x
    x = 21,820.22/139.12
  6. Step 6: Final answer
    x = 156.85

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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.