Home / 20,855.73-28,781.37-11,903.05

Finding the Fourth Proportional to 20,855.73, 28,781.37 and 11,903.05

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Solution

The fourth proportional to 20,855.73, 28,781.37 and 11,903.05 is: 16,426.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.73 : 28,781.37 = 11,903.05 : x
  2. Step 2: Convert to fraction form
    20,855.73/28,781.37 = 11,903.05/x
  3. Step 3: Cross multiply
    20,855.73x = 28,781.37 × 11,903.05
  4. Step 4: Simplify right side
    20,855.73x = 342,585,969.59
  5. Step 5: Solve for x
    x = 342,585,969.59/20,855.73
  6. Step 6: Final answer
    x = 16,426.47

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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.