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Finding the Fourth Proportional to 138.39, 189.98 and 118.95

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Solution

The fourth proportional to 138.39, 189.98 and 118.95 is: 163.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.39 : 189.98 = 118.95 : x
  2. Step 2: Convert to fraction form
    138.39/189.98 = 118.95/x
  3. Step 3: Cross multiply
    138.39x = 189.98 × 118.95
  4. Step 4: Simplify right side
    138.39x = 22,597.53
  5. Step 5: Solve for x
    x = 22,597.53/138.39
  6. Step 6: Final answer
    x = 163.29

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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.