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Finding the Fourth Proportional to 45,322.72, 67,972.20 and 20,348.80

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Solution

The fourth proportional to 45,322.72, 67,972.20 and 20,348.80 is: 30,517.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,322.72 : 67,972.20 = 20,348.80 : x
  2. Step 2: Convert to fraction form
    45,322.72/67,972.20 = 20,348.80/x
  3. Step 3: Cross multiply
    45,322.72x = 67,972.20 × 20,348.80
  4. Step 4: Simplify right side
    45,322.72x = 1,383,152,703.36
  5. Step 5: Solve for x
    x = 1,383,152,703.36/45,322.72
  6. Step 6: Final answer
    x = 30,517.87

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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.