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Finding the Fourth Proportional to 5,781.20, 7,978.11 and 3,128.66

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Solution

The fourth proportional to 5,781.20, 7,978.11 and 3,128.66 is: 4,317.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,781.20 : 7,978.11 = 3,128.66 : x
  2. Step 2: Convert to fraction form
    5,781.20/7,978.11 = 3,128.66/x
  3. Step 3: Cross multiply
    5,781.20x = 7,978.11 × 3,128.66
  4. Step 4: Simplify right side
    5,781.20x = 24,960,785.81
  5. Step 5: Solve for x
    x = 24,960,785.81/5,781.20
  6. Step 6: Final answer
    x = 4,317.58

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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.