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Finding the Fourth Proportional to 311.65, 429.20 and 272.16

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Solution

The fourth proportional to 311.65, 429.20 and 272.16 is: 374.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.65 : 429.20 = 272.16 : x
  2. Step 2: Convert to fraction form
    311.65/429.20 = 272.16/x
  3. Step 3: Cross multiply
    311.65x = 429.20 × 272.16
  4. Step 4: Simplify right side
    311.65x = 116,810.73
  5. Step 5: Solve for x
    x = 116,810.73/311.65
  6. Step 6: Final answer
    x = 374.82

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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.