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Finding the Fourth Proportional to 5,781.40, 7,978.31 and 3,128.85

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Solution

The fourth proportional to 5,781.40, 7,978.31 and 3,128.85 is: 4,317.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,781.40 : 7,978.31 = 3,128.85 : x
  2. Step 2: Convert to fraction form
    5,781.40/7,978.31 = 3,128.85/x
  3. Step 3: Cross multiply
    5,781.40x = 7,978.31 × 3,128.85
  4. Step 4: Simplify right side
    5,781.40x = 24,962,948.93
  5. Step 5: Solve for x
    x = 24,962,948.93/5,781.40
  6. Step 6: Final answer
    x = 4,317.81

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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.