Home / 20,998.20-31,521.60-12,120.60

Finding the Fourth Proportional to 20,998.20, 31,521.60 and 12,120.60

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Solution

The fourth proportional to 20,998.20, 31,521.60 and 12,120.60 is: 18,194.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,998.20 : 31,521.60 = 12,120.60 : x
  2. Step 2: Convert to fraction form
    20,998.20/31,521.60 = 12,120.60/x
  3. Step 3: Cross multiply
    20,998.20x = 31,521.60 × 12,120.60
  4. Step 4: Simplify right side
    20,998.20x = 382,060,704.96
  5. Step 5: Solve for x
    x = 382,060,704.96/20,998.20
  6. Step 6: Final answer
    x = 18,194.93

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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.