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Finding the Fourth Proportional to 72,811.70, 109,217.59 and 20,221.18

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Solution

The fourth proportional to 72,811.70, 109,217.59 and 20,221.18 is: 30,331.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,811.70 : 109,217.59 = 20,221.18 : x
  2. Step 2: Convert to fraction form
    72,811.70/109,217.59 = 20,221.18/x
  3. Step 3: Cross multiply
    72,811.70x = 109,217.59 × 20,221.18
  4. Step 4: Simplify right side
    72,811.70x = 2,208,508,546.56
  5. Step 5: Solve for x
    x = 2,208,508,546.56/72,811.70
  6. Step 6: Final answer
    x = 30,331.78

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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.