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Finding the Fourth Proportional to 137.19, 189.36 and 81.95

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Solution

The fourth proportional to 137.19, 189.36 and 81.95 is: 113.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.19 : 189.36 = 81.95 : x
  2. Step 2: Convert to fraction form
    137.19/189.36 = 81.95/x
  3. Step 3: Cross multiply
    137.19x = 189.36 × 81.95
  4. Step 4: Simplify right side
    137.19x = 15,517.11
  5. Step 5: Solve for x
    x = 15,517.11/137.19
  6. Step 6: Final answer
    x = 113.11

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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.