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Finding the Fourth Proportional to 189.20, 261.18 and 178.12

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Solution

The fourth proportional to 189.20, 261.18 and 178.12 is: 245.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.20 : 261.18 = 178.12 : x
  2. Step 2: Convert to fraction form
    189.20/261.18 = 178.12/x
  3. Step 3: Cross multiply
    189.20x = 261.18 × 178.12
  4. Step 4: Simplify right side
    189.20x = 46,521.38
  5. Step 5: Solve for x
    x = 46,521.38/189.20
  6. Step 6: Final answer
    x = 245.88

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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.