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Finding the Fourth Proportional to 5,721.60, 8,571.60 and 2,938.80

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Solution

The fourth proportional to 5,721.60, 8,571.60 and 2,938.80 is: 4,402.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,721.60 : 8,571.60 = 2,938.80 : x
  2. Step 2: Convert to fraction form
    5,721.60/8,571.60 = 2,938.80/x
  3. Step 3: Cross multiply
    5,721.60x = 8,571.60 × 2,938.80
  4. Step 4: Simplify right side
    5,721.60x = 25,190,218.08
  5. Step 5: Solve for x
    x = 25,190,218.08/5,721.60
  6. Step 6: Final answer
    x = 4,402.65

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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.