Home / 20,778.40-31,167.60-12,008.80

Finding the Fourth Proportional to 20,778.40, 31,167.60 and 12,008.80

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Solution

The fourth proportional to 20,778.40, 31,167.60 and 12,008.80 is: 18,013.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,778.40 : 31,167.60 = 12,008.80 : x
  2. Step 2: Convert to fraction form
    20,778.40/31,167.60 = 12,008.80/x
  3. Step 3: Cross multiply
    20,778.40x = 31,167.60 × 12,008.80
  4. Step 4: Simplify right side
    20,778.40x = 374,285,474.88
  5. Step 5: Solve for x
    x = 374,285,474.88/20,778.40
  6. Step 6: Final answer
    x = 18,013.20

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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.