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Finding the Fourth Proportional to 80,020.80, 120,031.20 and 73,281.60

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Solution

The fourth proportional to 80,020.80, 120,031.20 and 73,281.60 is: 109,922.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,020.80 : 120,031.20 = 73,281.60 : x
  2. Step 2: Convert to fraction form
    80,020.80/120,031.20 = 73,281.60/x
  3. Step 3: Cross multiply
    80,020.80x = 120,031.20 × 73,281.60
  4. Step 4: Simplify right side
    80,020.80x = 8,796,078,385.92
  5. Step 5: Solve for x
    x = 8,796,078,385.92/80,020.80
  6. Step 6: Final answer
    x = 109,922.40

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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.