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Finding the Fourth Proportional to 81,183.80, 121,775.70 and 72,630.20

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Solution

The fourth proportional to 81,183.80, 121,775.70 and 72,630.20 is: 108,945.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,183.80 : 121,775.70 = 72,630.20 : x
  2. Step 2: Convert to fraction form
    81,183.80/121,775.70 = 72,630.20/x
  3. Step 3: Cross multiply
    81,183.80x = 121,775.70 × 72,630.20
  4. Step 4: Simplify right side
    81,183.80x = 8,844,593,446.14
  5. Step 5: Solve for x
    x = 8,844,593,446.14/81,183.80
  6. Step 6: Final answer
    x = 108,945.30

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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.