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Finding the Fourth Proportional to 679.88, 1,020.08 and 269.31

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Solution

The fourth proportional to 679.88, 1,020.08 and 269.31 is: 404.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.88 : 1,020.08 = 269.31 : x
  2. Step 2: Convert to fraction form
    679.88/1,020.08 = 269.31/x
  3. Step 3: Cross multiply
    679.88x = 1,020.08 × 269.31
  4. Step 4: Simplify right side
    679.88x = 274,722.24
  5. Step 5: Solve for x
    x = 274,722.24/679.88
  6. Step 6: Final answer
    x = 404.07

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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.