Home / 20,190.40-30,249.15-18,878.20

Finding the Fourth Proportional to 20,190.40, 30,249.15 and 18,878.20

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Solution

The fourth proportional to 20,190.40, 30,249.15 and 18,878.20 is: 28,283.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,190.40 : 30,249.15 = 18,878.20 : x
  2. Step 2: Convert to fraction form
    20,190.40/30,249.15 = 18,878.20/x
  3. Step 3: Cross multiply
    20,190.40x = 30,249.15 × 18,878.20
  4. Step 4: Simplify right side
    20,190.40x = 571,049,503.53
  5. Step 5: Solve for x
    x = 571,049,503.53/20,190.40
  6. Step 6: Final answer
    x = 28,283.22

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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.