Home / 20,391.35-28,155.80-16,431.05

Finding the Fourth Proportional to 20,391.35, 28,155.80 and 16,431.05

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Solution

The fourth proportional to 20,391.35, 28,155.80 and 16,431.05 is: 22,687.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,391.35 : 28,155.80 = 16,431.05 : x
  2. Step 2: Convert to fraction form
    20,391.35/28,155.80 = 16,431.05/x
  3. Step 3: Cross multiply
    20,391.35x = 28,155.80 × 16,431.05
  4. Step 4: Simplify right side
    20,391.35x = 462,629,469.06
  5. Step 5: Solve for x
    x = 462,629,469.06/20,391.35
  6. Step 6: Final answer
    x = 22,687.54

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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.