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Finding the Fourth Proportional to 189.50, 261.42 and 115.78

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Solution

The fourth proportional to 189.50, 261.42 and 115.78 is: 159.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.50 : 261.42 = 115.78 : x
  2. Step 2: Convert to fraction form
    189.50/261.42 = 115.78/x
  3. Step 3: Cross multiply
    189.50x = 261.42 × 115.78
  4. Step 4: Simplify right side
    189.50x = 30,267.21
  5. Step 5: Solve for x
    x = 30,267.21/189.50
  6. Step 6: Final answer
    x = 159.72

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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.