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Finding the Fourth Proportional to 20,136.80, 30,205.20 and 19,164.80

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Solution

The fourth proportional to 20,136.80, 30,205.20 and 19,164.80 is: 28,747.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,136.80 : 30,205.20 = 19,164.80 : x
  2. Step 2: Convert to fraction form
    20,136.80/30,205.20 = 19,164.80/x
  3. Step 3: Cross multiply
    20,136.80x = 30,205.20 × 19,164.80
  4. Step 4: Simplify right side
    20,136.80x = 578,876,616.96
  5. Step 5: Solve for x
    x = 578,876,616.96/20,136.80
  6. Step 6: Final answer
    x = 28,747.20

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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.