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Finding the Fourth Proportional to 81,478.80, 122,218.20 and 71,629.20

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Solution

The fourth proportional to 81,478.80, 122,218.20 and 71,629.20 is: 107,443.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,478.80 : 122,218.20 = 71,629.20 : x
  2. Step 2: Convert to fraction form
    81,478.80/122,218.20 = 71,629.20/x
  3. Step 3: Cross multiply
    81,478.80x = 122,218.20 × 71,629.20
  4. Step 4: Simplify right side
    81,478.80x = 8,754,391,891.44
  5. Step 5: Solve for x
    x = 8,754,391,891.44/81,478.80
  6. Step 6: Final answer
    x = 107,443.80

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1.5x scale

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.