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Finding the Fourth Proportional to 679.98, 1,020.24 and 247.17

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Solution

The fourth proportional to 679.98, 1,020.24 and 247.17 is: 370.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.98 : 1,020.24 = 247.17 : x
  2. Step 2: Convert to fraction form
    679.98/1,020.24 = 247.17/x
  3. Step 3: Cross multiply
    679.98x = 1,020.24 × 247.17
  4. Step 4: Simplify right side
    679.98x = 252,172.72
  5. Step 5: Solve for x
    x = 252,172.72/679.98
  6. Step 6: Final answer
    x = 370.85

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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.