Home / 20,405.60-28,159.74-11,453.96

Finding the Fourth Proportional to 20,405.60, 28,159.74 and 11,453.96

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Solution

The fourth proportional to 20,405.60, 28,159.74 and 11,453.96 is: 15,806.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,405.60 : 28,159.74 = 11,453.96 : x
  2. Step 2: Convert to fraction form
    20,405.60/28,159.74 = 11,453.96/x
  3. Step 3: Cross multiply
    20,405.60x = 28,159.74 × 11,453.96
  4. Step 4: Simplify right side
    20,405.60x = 322,540,535.57
  5. Step 5: Solve for x
    x = 322,540,535.57/20,405.60
  6. Step 6: Final answer
    x = 15,806.47

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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.