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Finding the Fourth Proportional to 189.62, 261.71 and 115

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Solution

The fourth proportional to 189.62, 261.71 and 115 is: 158.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.62 : 261.71 = 115 : x
  2. Step 2: Convert to fraction form
    189.62/261.71 = 115/x
  3. Step 3: Cross multiply
    189.62x = 261.71 × 115
  4. Step 4: Simplify right side
    189.62x = 30,096.65
  5. Step 5: Solve for x
    x = 30,096.65/189.62
  6. Step 6: Final answer
    x = 158.72

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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.