Home / 20,405.61-28,161.90-11,453.18

Finding the Fourth Proportional to 20,405.61, 28,161.90 and 11,453.18

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Solution

The fourth proportional to 20,405.61, 28,161.90 and 11,453.18 is: 15,806.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,405.61 : 28,161.90 = 11,453.18 : x
  2. Step 2: Convert to fraction form
    20,405.61/28,161.90 = 11,453.18/x
  3. Step 3: Cross multiply
    20,405.61x = 28,161.90 × 11,453.18
  4. Step 4: Simplify right side
    20,405.61x = 322,543,169.03
  5. Step 5: Solve for x
    x = 322,543,169.03/20,405.61
  6. Step 6: Final answer
    x = 15,806.59

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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.