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Finding the Fourth Proportional to 311.01, 429.20 and 178.18

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Solution

The fourth proportional to 311.01, 429.20 and 178.18 is: 245.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.01 : 429.20 = 178.18 : x
  2. Step 2: Convert to fraction form
    311.01/429.20 = 178.18/x
  3. Step 3: Cross multiply
    311.01x = 429.20 × 178.18
  4. Step 4: Simplify right side
    311.01x = 76,475.97
  5. Step 5: Solve for x
    x = 76,475.97/311.01
  6. Step 6: Final answer
    x = 245.90

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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.