Home / 20,982.87-28,935.86-13,426.45

Finding the Fourth Proportional to 20,982.87, 28,935.86 and 13,426.45

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Solution

The fourth proportional to 20,982.87, 28,935.86 and 13,426.45 is: 18,515.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,982.87 : 28,935.86 = 13,426.45 : x
  2. Step 2: Convert to fraction form
    20,982.87/28,935.86 = 13,426.45/x
  3. Step 3: Cross multiply
    20,982.87x = 28,935.86 × 13,426.45
  4. Step 4: Simplify right side
    20,982.87x = 388,505,738.03
  5. Step 5: Solve for x
    x = 388,505,738.03/20,982.87
  6. Step 6: Final answer
    x = 18,515.38

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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.