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Finding the Fourth Proportional to 674.80, 1,012.12 and 212.56

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Solution

The fourth proportional to 674.80, 1,012.12 and 212.56 is: 318.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.80 : 1,012.12 = 212.56 : x
  2. Step 2: Convert to fraction form
    674.80/1,012.12 = 212.56/x
  3. Step 3: Cross multiply
    674.80x = 1,012.12 × 212.56
  4. Step 4: Simplify right side
    674.80x = 215,136.23
  5. Step 5: Solve for x
    x = 215,136.23/674.80
  6. Step 6: Final answer
    x = 318.82

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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.