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Finding the Fourth Proportional to 312.74, 431.40 and 229.70

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Solution

The fourth proportional to 312.74, 431.40 and 229.70 is: 316.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.74 : 431.40 = 229.70 : x
  2. Step 2: Convert to fraction form
    312.74/431.40 = 229.70/x
  3. Step 3: Cross multiply
    312.74x = 431.40 × 229.70
  4. Step 4: Simplify right side
    312.74x = 99,092.58
  5. Step 5: Solve for x
    x = 99,092.58/312.74
  6. Step 6: Final answer
    x = 316.85

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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.