Home / 20,876.20-31,323.30-12,118.60

Finding the Fourth Proportional to 20,876.20, 31,323.30 and 12,118.60

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Solution

The fourth proportional to 20,876.20, 31,323.30 and 12,118.60 is: 18,183.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,876.20 : 31,323.30 = 12,118.60 : x
  2. Step 2: Convert to fraction form
    20,876.20/31,323.30 = 12,118.60/x
  3. Step 3: Cross multiply
    20,876.20x = 31,323.30 × 12,118.60
  4. Step 4: Simplify right side
    20,876.20x = 379,594,543.38
  5. Step 5: Solve for x
    x = 379,594,543.38/20,876.20
  6. Step 6: Final answer
    x = 18,183.12

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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.