Home / 28,380.78-39,166.20-15,805.80

Finding the Fourth Proportional to 28,380.78, 39,166.20 and 15,805.80

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Solution

The fourth proportional to 28,380.78, 39,166.20 and 15,805.80 is: 21,812.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,380.78 : 39,166.20 = 15,805.80 : x
  2. Step 2: Convert to fraction form
    28,380.78/39,166.20 = 15,805.80/x
  3. Step 3: Cross multiply
    28,380.78x = 39,166.20 × 15,805.80
  4. Step 4: Simplify right side
    28,380.78x = 619,053,123.96
  5. Step 5: Solve for x
    x = 619,053,123.96/28,380.78
  6. Step 6: Final answer
    x = 21,812.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.