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Finding the Fourth Proportional to 311.72, 430.18 and 171.84

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Solution

The fourth proportional to 311.72, 430.18 and 171.84 is: 237.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.72 : 430.18 = 171.84 : x
  2. Step 2: Convert to fraction form
    311.72/430.18 = 171.84/x
  3. Step 3: Cross multiply
    311.72x = 430.18 × 171.84
  4. Step 4: Simplify right side
    311.72x = 73,922.13
  5. Step 5: Solve for x
    x = 73,922.13/311.72
  6. Step 6: Final answer
    x = 237.15

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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.