Home / 20,860.24-28,789.20-11,909.10

Finding the Fourth Proportional to 20,860.24, 28,789.20 and 11,909.10

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Solution

The fourth proportional to 20,860.24, 28,789.20 and 11,909.10 is: 16,435.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,860.24 : 28,789.20 = 11,909.10 : x
  2. Step 2: Convert to fraction form
    20,860.24/28,789.20 = 11,909.10/x
  3. Step 3: Cross multiply
    20,860.24x = 28,789.20 × 11,909.10
  4. Step 4: Simplify right side
    20,860.24x = 342,853,461.72
  5. Step 5: Solve for x
    x = 342,853,461.72/20,860.24
  6. Step 6: Final answer
    x = 16,435.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.