Home / 20,839.80-28,751.18-13,284.40

Finding the Fourth Proportional to 20,839.80, 28,751.18 and 13,284.40

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Solution

The fourth proportional to 20,839.80, 28,751.18 and 13,284.40 is: 18,327.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,839.80 : 28,751.18 = 13,284.40 : x
  2. Step 2: Convert to fraction form
    20,839.80/28,751.18 = 13,284.40/x
  3. Step 3: Cross multiply
    20,839.80x = 28,751.18 × 13,284.40
  4. Step 4: Simplify right side
    20,839.80x = 381,942,175.59
  5. Step 5: Solve for x
    x = 381,942,175.59/20,839.80
  6. Step 6: Final answer
    x = 18,327.54

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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.