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Finding the Fourth Proportional to 20,136.70, 30,205.05 and 12,773.80

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Solution

The fourth proportional to 20,136.70, 30,205.05 and 12,773.80 is: 19,160.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,136.70 : 30,205.05 = 12,773.80 : x
  2. Step 2: Convert to fraction form
    20,136.70/30,205.05 = 12,773.80/x
  3. Step 3: Cross multiply
    20,136.70x = 30,205.05 × 12,773.80
  4. Step 4: Simplify right side
    20,136.70x = 385,833,267.69
  5. Step 5: Solve for x
    x = 385,833,267.69/20,136.70
  6. Step 6: Final answer
    x = 19,160.70

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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.