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Finding the Fourth Proportional to 2,761.78, 4,142.22 and 813.53

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Solution

The fourth proportional to 2,761.78, 4,142.22 and 813.53 is: 1,220.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,761.78 : 4,142.22 = 813.53 : x
  2. Step 2: Convert to fraction form
    2,761.78/4,142.22 = 813.53/x
  3. Step 3: Cross multiply
    2,761.78x = 4,142.22 × 813.53
  4. Step 4: Simplify right side
    2,761.78x = 3,369,820.24
  5. Step 5: Solve for x
    x = 3,369,820.24/2,761.78
  6. Step 6: Final answer
    x = 1,220.16

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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.