Home / 20,436.39-28,213.79-13,272.71

Finding the Fourth Proportional to 20,436.39, 28,213.79 and 13,272.71

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Solution

The fourth proportional to 20,436.39, 28,213.79 and 13,272.71 is: 18,323.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,436.39 : 28,213.79 = 13,272.71 : x
  2. Step 2: Convert to fraction form
    20,436.39/28,213.79 = 13,272.71/x
  3. Step 3: Cross multiply
    20,436.39x = 28,213.79 × 13,272.71
  4. Step 4: Simplify right side
    20,436.39x = 374,473,245.24
  5. Step 5: Solve for x
    x = 374,473,245.24/20,436.39
  6. Step 6: Final answer
    x = 18,323.85

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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.