Home / 20,821.28-28,736.64-13,270.96

Finding the Fourth Proportional to 20,821.28, 28,736.64 and 13,270.96

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Solution

The fourth proportional to 20,821.28, 28,736.64 and 13,270.96 is: 18,316.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.28 : 28,736.64 = 13,270.96 : x
  2. Step 2: Convert to fraction form
    20,821.28/28,736.64 = 13,270.96/x
  3. Step 3: Cross multiply
    20,821.28x = 28,736.64 × 13,270.96
  4. Step 4: Simplify right side
    20,821.28x = 381,362,799.97
  5. Step 5: Solve for x
    x = 381,362,799.97/20,821.28
  6. Step 6: Final answer
    x = 18,316.01

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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.