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Finding the Fourth Proportional to 137.81, 189.56 and 112.59

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Solution

The fourth proportional to 137.81, 189.56 and 112.59 is: 154.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.81 : 189.56 = 112.59 : x
  2. Step 2: Convert to fraction form
    137.81/189.56 = 112.59/x
  3. Step 3: Cross multiply
    137.81x = 189.56 × 112.59
  4. Step 4: Simplify right side
    137.81x = 21,342.00
  5. Step 5: Solve for x
    x = 21,342.00/137.81
  6. Step 6: Final answer
    x = 154.87

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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.