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Finding the Fourth Proportional to 80,418.80, 120,743.40 and 45,426.80

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Solution

The fourth proportional to 80,418.80, 120,743.40 and 45,426.80 is: 68,205.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,418.80 : 120,743.40 = 45,426.80 : x
  2. Step 2: Convert to fraction form
    80,418.80/120,743.40 = 45,426.80/x
  3. Step 3: Cross multiply
    80,418.80x = 120,743.40 × 45,426.80
  4. Step 4: Simplify right side
    80,418.80x = 5,484,986,283.12
  5. Step 5: Solve for x
    x = 5,484,986,283.12/80,418.80
  6. Step 6: Final answer
    x = 68,205.27

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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.