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Finding the Fourth Proportional to 680.72, 1,020.18 and 247.46

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Solution

The fourth proportional to 680.72, 1,020.18 and 247.46 is: 370.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.72 : 1,020.18 = 247.46 : x
  2. Step 2: Convert to fraction form
    680.72/1,020.18 = 247.46/x
  3. Step 3: Cross multiply
    680.72x = 1,020.18 × 247.46
  4. Step 4: Simplify right side
    680.72x = 252,453.74
  5. Step 5: Solve for x
    x = 252,453.74/680.72
  6. Step 6: Final answer
    x = 370.86

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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.