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Finding the Fourth Proportional to 80,421.80, 120,747.90 and 45,429.80

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Solution

The fourth proportional to 80,421.80, 120,747.90 and 45,429.80 is: 68,209.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,421.80 : 120,747.90 = 45,429.80 : x
  2. Step 2: Convert to fraction form
    80,421.80/120,747.90 = 45,429.80/x
  3. Step 3: Cross multiply
    80,421.80x = 120,747.90 × 45,429.80
  4. Step 4: Simplify right side
    80,421.80x = 5,485,552,947.42
  5. Step 5: Solve for x
    x = 5,485,552,947.42/80,421.80
  6. Step 6: Final answer
    x = 68,209.78

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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.