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Finding the Fourth Proportional to 1,042.50, 1,560.78 and 676.20

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Solution

The fourth proportional to 1,042.50, 1,560.78 and 676.20 is: 1,012.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.50 : 1,560.78 = 676.20 : x
  2. Step 2: Convert to fraction form
    1,042.50/1,560.78 = 676.20/x
  3. Step 3: Cross multiply
    1,042.50x = 1,560.78 × 676.20
  4. Step 4: Simplify right side
    1,042.50x = 1,055,399.44
  5. Step 5: Solve for x
    x = 1,055,399.44/1,042.50
  6. Step 6: Final answer
    x = 1,012.37

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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.