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Finding the Fourth Proportional to 1,008.60, 1,512.90 and 680.55

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Solution

The fourth proportional to 1,008.60, 1,512.90 and 680.55 is: 1,020.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.60 : 1,512.90 = 680.55 : x
  2. Step 2: Convert to fraction form
    1,008.60/1,512.90 = 680.55/x
  3. Step 3: Cross multiply
    1,008.60x = 1,512.90 × 680.55
  4. Step 4: Simplify right side
    1,008.60x = 1,029,604.10
  5. Step 5: Solve for x
    x = 1,029,604.10/1,008.60
  6. Step 6: Final answer
    x = 1,020.83

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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.