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Finding the Fourth Proportional to 2,761.80, 4,142.76 and 709.80

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Solution

The fourth proportional to 2,761.80, 4,142.76 and 709.80 is: 1,064.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,761.80 : 4,142.76 = 709.80 : x
  2. Step 2: Convert to fraction form
    2,761.80/4,142.76 = 709.80/x
  3. Step 3: Cross multiply
    2,761.80x = 4,142.76 × 709.80
  4. Step 4: Simplify right side
    2,761.80x = 2,940,531.05
  5. Step 5: Solve for x
    x = 2,940,531.05/2,761.80
  6. Step 6: Final answer
    x = 1,064.72

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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.