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Finding the Fourth Proportional to 189.38, 261.24 and 115.68

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Solution

The fourth proportional to 189.38, 261.24 and 115.68 is: 159.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.38 : 261.24 = 115.68 : x
  2. Step 2: Convert to fraction form
    189.38/261.24 = 115.68/x
  3. Step 3: Cross multiply
    189.38x = 261.24 × 115.68
  4. Step 4: Simplify right side
    189.38x = 30,220.24
  5. Step 5: Solve for x
    x = 30,220.24/189.38
  6. Step 6: Final answer
    x = 159.57

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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.