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Finding the Fourth Proportional to 674.65, 1,011.97 and 212.43

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Solution

The fourth proportional to 674.65, 1,011.97 and 212.43 is: 318.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.65 : 1,011.97 = 212.43 : x
  2. Step 2: Convert to fraction form
    674.65/1,011.97 = 212.43/x
  3. Step 3: Cross multiply
    674.65x = 1,011.97 × 212.43
  4. Step 4: Simplify right side
    674.65x = 214,967.73
  5. Step 5: Solve for x
    x = 214,967.73/674.65
  6. Step 6: Final answer
    x = 318.64

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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.