Home / 20,809.80-31,149.90-12,018.60

Finding the Fourth Proportional to 20,809.80, 31,149.90 and 12,018.60

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Solution

The fourth proportional to 20,809.80, 31,149.90 and 12,018.60 is: 17,990.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,809.80 : 31,149.90 = 12,018.60 : x
  2. Step 2: Convert to fraction form
    20,809.80/31,149.90 = 12,018.60/x
  3. Step 3: Cross multiply
    20,809.80x = 31,149.90 × 12,018.60
  4. Step 4: Simplify right side
    20,809.80x = 374,378,188.14
  5. Step 5: Solve for x
    x = 374,378,188.14/20,809.80
  6. Step 6: Final answer
    x = 17,990.48

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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.