Home / 20,860.78-31,291.15-8,380.80

Finding the Fourth Proportional to 20,860.78, 31,291.15 and 8,380.80

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Solution

The fourth proportional to 20,860.78, 31,291.15 and 8,380.80 is: 12,571.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,860.78 : 31,291.15 = 8,380.80 : x
  2. Step 2: Convert to fraction form
    20,860.78/31,291.15 = 8,380.80/x
  3. Step 3: Cross multiply
    20,860.78x = 31,291.15 × 8,380.80
  4. Step 4: Simplify right side
    20,860.78x = 262,244,869.92
  5. Step 5: Solve for x
    x = 262,244,869.92/20,860.78
  6. Step 6: Final answer
    x = 12,571.19

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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.