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Finding the Fourth Proportional to 674.11, 1,011.30 and 211.96

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Solution

The fourth proportional to 674.11, 1,011.30 and 211.96 is: 317.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.11 : 1,011.30 = 211.96 : x
  2. Step 2: Convert to fraction form
    674.11/1,011.30 = 211.96/x
  3. Step 3: Cross multiply
    674.11x = 1,011.30 × 211.96
  4. Step 4: Simplify right side
    674.11x = 214,349.03
  5. Step 5: Solve for x
    x = 214,349.03/674.11
  6. Step 6: Final answer
    x = 317.98

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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.