Home / 20,511.39-28,305.80-11,559.03

Finding the Fourth Proportional to 20,511.39, 28,305.80 and 11,559.03

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Solution

The fourth proportional to 20,511.39, 28,305.80 and 11,559.03 is: 15,951.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,511.39 : 28,305.80 = 11,559.03 : x
  2. Step 2: Convert to fraction form
    20,511.39/28,305.80 = 11,559.03/x
  3. Step 3: Cross multiply
    20,511.39x = 28,305.80 × 11,559.03
  4. Step 4: Simplify right side
    20,511.39x = 327,187,591.37
  5. Step 5: Solve for x
    x = 327,187,591.37/20,511.39
  6. Step 6: Final answer
    x = 15,951.51

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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.