Home / 20,078.20-30,182.10-18,911.80

Finding the Fourth Proportional to 20,078.20, 30,182.10 and 18,911.80

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Solution

The fourth proportional to 20,078.20, 30,182.10 and 18,911.80 is: 28,428.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,078.20 : 30,182.10 = 18,911.80 : x
  2. Step 2: Convert to fraction form
    20,078.20/30,182.10 = 18,911.80/x
  3. Step 3: Cross multiply
    20,078.20x = 30,182.10 × 18,911.80
  4. Step 4: Simplify right side
    20,078.20x = 570,797,838.78
  5. Step 5: Solve for x
    x = 570,797,838.78/20,078.20
  6. Step 6: Final answer
    x = 28,428.74

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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.