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Finding the Fourth Proportional to 5,781.10, 7,978.20 and 3,543.10

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Solution

The fourth proportional to 5,781.10, 7,978.20 and 3,543.10 is: 4,889.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,781.10 : 7,978.20 = 3,543.10 : x
  2. Step 2: Convert to fraction form
    5,781.10/7,978.20 = 3,543.10/x
  3. Step 3: Cross multiply
    5,781.10x = 7,978.20 × 3,543.10
  4. Step 4: Simplify right side
    5,781.10x = 28,267,560.42
  5. Step 5: Solve for x
    x = 28,267,560.42/5,781.10
  6. Step 6: Final answer
    x = 4,889.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.