Home / 28,478.88-42,757.20-18,136.80

Finding the Fourth Proportional to 28,478.88, 42,757.20 and 18,136.80

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Solution

The fourth proportional to 28,478.88, 42,757.20 and 18,136.80 is: 27,229.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,478.88 : 42,757.20 = 18,136.80 : x
  2. Step 2: Convert to fraction form
    28,478.88/42,757.20 = 18,136.80/x
  3. Step 3: Cross multiply
    28,478.88x = 42,757.20 × 18,136.80
  4. Step 4: Simplify right side
    28,478.88x = 775,478,784.96
  5. Step 5: Solve for x
    x = 775,478,784.96/28,478.88
  6. Step 6: Final answer
    x = 27,229.96

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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.