Home / 20,661.55-28,517.39-13,118.21

Finding the Fourth Proportional to 20,661.55, 28,517.39 and 13,118.21

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Solution

The fourth proportional to 20,661.55, 28,517.39 and 13,118.21 is: 18,105.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,661.55 : 28,517.39 = 13,118.21 : x
  2. Step 2: Convert to fraction form
    20,661.55/28,517.39 = 13,118.21/x
  3. Step 3: Cross multiply
    20,661.55x = 28,517.39 × 13,118.21
  4. Step 4: Simplify right side
    20,661.55x = 374,097,110.67
  5. Step 5: Solve for x
    x = 374,097,110.67/20,661.55
  6. Step 6: Final answer
    x = 18,105.96

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Double scale
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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.