Home / 20,636.12-28,478.44-12,138.82

Finding the Fourth Proportional to 20,636.12, 28,478.44 and 12,138.82

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Solution

The fourth proportional to 20,636.12, 28,478.44 and 12,138.82 is: 16,751.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,636.12 : 28,478.44 = 12,138.82 : x
  2. Step 2: Convert to fraction form
    20,636.12/28,478.44 = 12,138.82/x
  3. Step 3: Cross multiply
    20,636.12x = 28,478.44 × 12,138.82
  4. Step 4: Simplify right side
    20,636.12x = 345,694,657.04
  5. Step 5: Solve for x
    x = 345,694,657.04/20,636.12
  6. Step 6: Final answer
    x = 16,751.92

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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.