Home / 20,789.11-28,689.15-11,357.61

Finding the Fourth Proportional to 20,789.11, 28,689.15 and 11,357.61

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Solution

The fourth proportional to 20,789.11, 28,689.15 and 11,357.61 is: 15,673.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,789.11 : 28,689.15 = 11,357.61 : x
  2. Step 2: Convert to fraction form
    20,789.11/28,689.15 = 11,357.61/x
  3. Step 3: Cross multiply
    20,789.11x = 28,689.15 × 11,357.61
  4. Step 4: Simplify right side
    20,789.11x = 325,840,176.93
  5. Step 5: Solve for x
    x = 325,840,176.93/20,789.11
  6. Step 6: Final answer
    x = 15,673.60

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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.