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Finding the Fourth Proportional to 679.94, 1,020.09 and 247.14

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Solution

The fourth proportional to 679.94, 1,020.09 and 247.14 is: 370.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.94 : 1,020.09 = 247.14 : x
  2. Step 2: Convert to fraction form
    679.94/1,020.09 = 247.14/x
  3. Step 3: Cross multiply
    679.94x = 1,020.09 × 247.14
  4. Step 4: Simplify right side
    679.94x = 252,105.04
  5. Step 5: Solve for x
    x = 252,105.04/679.94
  6. Step 6: Final answer
    x = 370.78

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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.