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Finding the Fourth Proportional to 71,615.20, 107,422.80 and 40,511.20

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Solution

The fourth proportional to 71,615.20, 107,422.80 and 40,511.20 is: 60,766.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,615.20 : 107,422.80 = 40,511.20 : x
  2. Step 2: Convert to fraction form
    71,615.20/107,422.80 = 40,511.20/x
  3. Step 3: Cross multiply
    71,615.20x = 107,422.80 × 40,511.20
  4. Step 4: Simplify right side
    71,615.20x = 4,351,826,535.36
  5. Step 5: Solve for x
    x = 4,351,826,535.36/71,615.20
  6. Step 6: Final answer
    x = 60,766.80

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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.