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Finding the Fourth Proportional to 189.90, 261.98 and 115.18

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Solution

The fourth proportional to 189.90, 261.98 and 115.18 is: 158.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.90 : 261.98 = 115.18 : x
  2. Step 2: Convert to fraction form
    189.90/261.98 = 115.18/x
  3. Step 3: Cross multiply
    189.90x = 261.98 × 115.18
  4. Step 4: Simplify right side
    189.90x = 30,174.86
  5. Step 5: Solve for x
    x = 30,174.86/189.90
  6. Step 6: Final answer
    x = 158.90

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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.