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Finding the Fourth Proportional to 71,619.20, 107,428.80 and 40,515.20

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Solution

The fourth proportional to 71,619.20, 107,428.80 and 40,515.20 is: 60,772.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,619.20 : 107,428.80 = 40,515.20 : x
  2. Step 2: Convert to fraction form
    71,619.20/107,428.80 = 40,515.20/x
  3. Step 3: Cross multiply
    71,619.20x = 107,428.80 × 40,515.20
  4. Step 4: Simplify right side
    71,619.20x = 4,352,499,317.76
  5. Step 5: Solve for x
    x = 4,352,499,317.76/71,619.20
  6. Step 6: Final answer
    x = 60,772.80

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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.