Home / 20,557.20-30,864.60-12,781.20

Finding the Fourth Proportional to 20,557.20, 30,864.60 and 12,781.20

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Solution

The fourth proportional to 20,557.20, 30,864.60 and 12,781.20 is: 19,189.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,557.20 : 30,864.60 = 12,781.20 : x
  2. Step 2: Convert to fraction form
    20,557.20/30,864.60 = 12,781.20/x
  3. Step 3: Cross multiply
    20,557.20x = 30,864.60 × 12,781.20
  4. Step 4: Simplify right side
    20,557.20x = 394,486,625.52
  5. Step 5: Solve for x
    x = 394,486,625.52/20,557.20
  6. Step 6: Final answer
    x = 19,189.71

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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.