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Finding the Fourth Proportional to 679.72, 1,020.12 and 269.14

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Solution

The fourth proportional to 679.72, 1,020.12 and 269.14 is: 403.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.72 : 1,020.12 = 269.14 : x
  2. Step 2: Convert to fraction form
    679.72/1,020.12 = 269.14/x
  3. Step 3: Cross multiply
    679.72x = 1,020.12 × 269.14
  4. Step 4: Simplify right side
    679.72x = 274,555.10
  5. Step 5: Solve for x
    x = 274,555.10/679.72
  6. Step 6: Final answer
    x = 403.92

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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.