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Finding the Fourth Proportional to 680.90, 1,020.73 and 247.75

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Solution

The fourth proportional to 680.90, 1,020.73 and 247.75 is: 371.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.90 : 1,020.73 = 247.75 : x
  2. Step 2: Convert to fraction form
    680.90/1,020.73 = 247.75/x
  3. Step 3: Cross multiply
    680.90x = 1,020.73 × 247.75
  4. Step 4: Simplify right side
    680.90x = 252,885.86
  5. Step 5: Solve for x
    x = 252,885.86/680.90
  6. Step 6: Final answer
    x = 371.40

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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.