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Finding the Fourth Proportional to 679.10, 1,016.80 and 353.78

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Solution

The fourth proportional to 679.10, 1,016.80 and 353.78 is: 529.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.10 : 1,016.80 = 353.78 : x
  2. Step 2: Convert to fraction form
    679.10/1,016.80 = 353.78/x
  3. Step 3: Cross multiply
    679.10x = 1,016.80 × 353.78
  4. Step 4: Simplify right side
    679.10x = 359,723.50
  5. Step 5: Solve for x
    x = 359,723.50/679.10
  6. Step 6: Final answer
    x = 529.71

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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.