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Finding the Fourth Proportional to 674.18, 1,010.78 and 211.70

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Solution

The fourth proportional to 674.18, 1,010.78 and 211.70 is: 317.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.18 : 1,010.78 = 211.70 : x
  2. Step 2: Convert to fraction form
    674.18/1,010.78 = 211.70/x
  3. Step 3: Cross multiply
    674.18x = 1,010.78 × 211.70
  4. Step 4: Simplify right side
    674.18x = 213,978.54
  5. Step 5: Solve for x
    x = 213,978.54/674.18
  6. Step 6: Final answer
    x = 317.39

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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.