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Finding the Fourth Proportional to 189.39, 261.31 and 115.68

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Solution

The fourth proportional to 189.39, 261.31 and 115.68 is: 159.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.39 : 261.31 = 115.68 : x
  2. Step 2: Convert to fraction form
    189.39/261.31 = 115.68/x
  3. Step 3: Cross multiply
    189.39x = 261.31 × 115.68
  4. Step 4: Simplify right side
    189.39x = 30,228.34
  5. Step 5: Solve for x
    x = 30,228.34/189.39
  6. Step 6: Final answer
    x = 159.61

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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.