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Finding the Fourth Proportional to 139.10, 191.80 and 118.34

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Solution

The fourth proportional to 139.10, 191.80 and 118.34 is: 163.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.10 : 191.80 = 118.34 : x
  2. Step 2: Convert to fraction form
    139.10/191.80 = 118.34/x
  3. Step 3: Cross multiply
    139.10x = 191.80 × 118.34
  4. Step 4: Simplify right side
    139.10x = 22,697.52
  5. Step 5: Solve for x
    x = 22,697.52/139.10
  6. Step 6: Final answer
    x = 163.18

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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.