Home / 20,405.09-28,161.76-11,453.08

Finding the Fourth Proportional to 20,405.09, 28,161.76 and 11,453.08

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Solution

The fourth proportional to 20,405.09, 28,161.76 and 11,453.08 is: 15,806.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,405.09 : 28,161.76 = 11,453.08 : x
  2. Step 2: Convert to fraction form
    20,405.09/28,161.76 = 11,453.08/x
  3. Step 3: Cross multiply
    20,405.09x = 28,161.76 × 11,453.08
  4. Step 4: Simplify right side
    20,405.09x = 322,538,749.41
  5. Step 5: Solve for x
    x = 322,538,749.41/20,405.09
  6. Step 6: Final answer
    x = 15,806.78

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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.