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Finding the Fourth Proportional to 20,616.80, 30,869.80 and 16,963.12

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Solution

The fourth proportional to 20,616.80, 30,869.80 and 16,963.12 is: 25,399.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,616.80 : 30,869.80 = 16,963.12 : x
  2. Step 2: Convert to fraction form
    20,616.80/30,869.80 = 16,963.12/x
  3. Step 3: Cross multiply
    20,616.80x = 30,869.80 × 16,963.12
  4. Step 4: Simplify right side
    20,616.80x = 523,648,121.78
  5. Step 5: Solve for x
    x = 523,648,121.78/20,616.80
  6. Step 6: Final answer
    x = 25,399.10

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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.