Home / 20,920.85-28,850.94-13,738.08

Finding the Fourth Proportional to 20,920.85, 28,850.94 and 13,738.08

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Solution

The fourth proportional to 20,920.85, 28,850.94 and 13,738.08 is: 18,945.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.85 : 28,850.94 = 13,738.08 : x
  2. Step 2: Convert to fraction form
    20,920.85/28,850.94 = 13,738.08/x
  3. Step 3: Cross multiply
    20,920.85x = 28,850.94 × 13,738.08
  4. Step 4: Simplify right side
    20,920.85x = 396,356,521.80
  5. Step 5: Solve for x
    x = 396,356,521.80/20,920.85
  6. Step 6: Final answer
    x = 18,945.53

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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.