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Finding the Fourth Proportional to 137.67, 189.72 and 135.78

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Solution

The fourth proportional to 137.67, 189.72 and 135.78 is: 187.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.67 : 189.72 = 135.78 : x
  2. Step 2: Convert to fraction form
    137.67/189.72 = 135.78/x
  3. Step 3: Cross multiply
    137.67x = 189.72 × 135.78
  4. Step 4: Simplify right side
    137.67x = 25,760.18
  5. Step 5: Solve for x
    x = 25,760.18/137.67
  6. Step 6: Final answer
    x = 187.12

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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.