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Finding the Fourth Proportional to 674.78, 1,012.21 and 212.56

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Solution

The fourth proportional to 674.78, 1,012.21 and 212.56 is: 318.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.78 : 1,012.21 = 212.56 : x
  2. Step 2: Convert to fraction form
    674.78/1,012.21 = 212.56/x
  3. Step 3: Cross multiply
    674.78x = 1,012.21 × 212.56
  4. Step 4: Simplify right side
    674.78x = 215,152.30
  5. Step 5: Solve for x
    x = 215,152.30/674.78
  6. Step 6: Final answer
    x = 318.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.