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Finding the Fourth Proportional to 137.38, 189.56 and 85.64

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Solution

The fourth proportional to 137.38, 189.56 and 85.64 is: 118.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.38 : 189.56 = 85.64 : x
  2. Step 2: Convert to fraction form
    137.38/189.56 = 85.64/x
  3. Step 3: Cross multiply
    137.38x = 189.56 × 85.64
  4. Step 4: Simplify right side
    137.38x = 16,233.92
  5. Step 5: Solve for x
    x = 16,233.92/137.38
  6. Step 6: Final answer
    x = 118.17

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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.