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Finding the Fourth Proportional to 5,781.53, 7,978.45 and 3,128.88

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Solution

The fourth proportional to 5,781.53, 7,978.45 and 3,128.88 is: 4,317.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,781.53 : 7,978.45 = 3,128.88 : x
  2. Step 2: Convert to fraction form
    5,781.53/7,978.45 = 3,128.88/x
  3. Step 3: Cross multiply
    5,781.53x = 7,978.45 × 3,128.88
  4. Step 4: Simplify right side
    5,781.53x = 24,963,612.64
  5. Step 5: Solve for x
    x = 24,963,612.64/5,781.53
  6. Step 6: Final answer
    x = 4,317.82

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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.