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Finding the Fourth Proportional to 137.09, 189.15 and 81.84

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Solution

The fourth proportional to 137.09, 189.15 and 81.84 is: 112.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.09 : 189.15 = 81.84 : x
  2. Step 2: Convert to fraction form
    137.09/189.15 = 81.84/x
  3. Step 3: Cross multiply
    137.09x = 189.15 × 81.84
  4. Step 4: Simplify right side
    137.09x = 15,480.04
  5. Step 5: Solve for x
    x = 15,480.04/137.09
  6. Step 6: Final answer
    x = 112.92

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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.