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Finding the Fourth Proportional to 120,000.80, 180,001.20 and 78,221.60

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Solution

The fourth proportional to 120,000.80, 180,001.20 and 78,221.60 is: 117,332.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,000.80 : 180,001.20 = 78,221.60 : x
  2. Step 2: Convert to fraction form
    120,000.80/180,001.20 = 78,221.60/x
  3. Step 3: Cross multiply
    120,000.80x = 180,001.20 × 78,221.60
  4. Step 4: Simplify right side
    120,000.80x = 14,079,981,865.92
  5. Step 5: Solve for x
    x = 14,079,981,865.92/120,000.80
  6. Step 6: Final answer
    x = 117,332.40

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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.