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Finding the Fourth Proportional to 189.62, 261.59 and 115.91

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Solution

The fourth proportional to 189.62, 261.59 and 115.91 is: 159.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.62 : 261.59 = 115.91 : x
  2. Step 2: Convert to fraction form
    189.62/261.59 = 115.91/x
  3. Step 3: Cross multiply
    189.62x = 261.59 × 115.91
  4. Step 4: Simplify right side
    189.62x = 30,320.90
  5. Step 5: Solve for x
    x = 30,320.90/189.62
  6. Step 6: Final answer
    x = 159.90

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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.