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Finding the Fourth Proportional to 679.90, 1,019.84 and 269.13

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Solution

The fourth proportional to 679.90, 1,019.84 and 269.13 is: 403.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.90 : 1,019.84 = 269.13 : x
  2. Step 2: Convert to fraction form
    679.90/1,019.84 = 269.13/x
  3. Step 3: Cross multiply
    679.90x = 1,019.84 × 269.13
  4. Step 4: Simplify right side
    679.90x = 274,470.21
  5. Step 5: Solve for x
    x = 274,470.21/679.90
  6. Step 6: Final answer
    x = 403.69

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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.