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Finding the Fourth Proportional to 312.20, 431.12 and 272.76

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Solution

The fourth proportional to 312.20, 431.12 and 272.76 is: 376.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.20 : 431.12 = 272.76 : x
  2. Step 2: Convert to fraction form
    312.20/431.12 = 272.76/x
  3. Step 3: Cross multiply
    312.20x = 431.12 × 272.76
  4. Step 4: Simplify right side
    312.20x = 117,592.29
  5. Step 5: Solve for x
    x = 117,592.29/312.20
  6. Step 6: Final answer
    x = 376.66

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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.