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Finding the Fourth Proportional to 10,615.20, 15,922.80 and 2,824.80

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Solution

The fourth proportional to 10,615.20, 15,922.80 and 2,824.80 is: 4,237.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,615.20 : 15,922.80 = 2,824.80 : x
  2. Step 2: Convert to fraction form
    10,615.20/15,922.80 = 2,824.80/x
  3. Step 3: Cross multiply
    10,615.20x = 15,922.80 × 2,824.80
  4. Step 4: Simplify right side
    10,615.20x = 44,978,725.44
  5. Step 5: Solve for x
    x = 44,978,725.44/10,615.20
  6. Step 6: Final answer
    x = 4,237.20

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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.