Home / 20,836.80-28,755.45-11,405.34

Finding the Fourth Proportional to 20,836.80, 28,755.45 and 11,405.34

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Solution

The fourth proportional to 20,836.80, 28,755.45 and 11,405.34 is: 15,739.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,836.80 : 28,755.45 = 11,405.34 : x
  2. Step 2: Convert to fraction form
    20,836.80/28,755.45 = 11,405.34/x
  3. Step 3: Cross multiply
    20,836.80x = 28,755.45 × 11,405.34
  4. Step 4: Simplify right side
    20,836.80x = 327,965,684.10
  5. Step 5: Solve for x
    x = 327,965,684.10/20,836.80
  6. Step 6: Final answer
    x = 15,739.73

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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.