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Finding the Fourth Proportional to 1,124.89, 1,686.78 and 680.60

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Solution

The fourth proportional to 1,124.89, 1,686.78 and 680.60 is: 1,020.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.89 : 1,686.78 = 680.60 : x
  2. Step 2: Convert to fraction form
    1,124.89/1,686.78 = 680.60/x
  3. Step 3: Cross multiply
    1,124.89x = 1,686.78 × 680.60
  4. Step 4: Simplify right side
    1,124.89x = 1,148,022.47
  5. Step 5: Solve for x
    x = 1,148,022.47/1,124.89
  6. Step 6: Final answer
    x = 1,020.56

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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.