Home / 21,010.20-28,993.32-11,578.80

Finding the Fourth Proportional to 21,010.20, 28,993.32 and 11,578.80

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Solution

The fourth proportional to 21,010.20, 28,993.32 and 11,578.80 is: 15,978.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,010.20 : 28,993.32 = 11,578.80 : x
  2. Step 2: Convert to fraction form
    21,010.20/28,993.32 = 11,578.80/x
  3. Step 3: Cross multiply
    21,010.20x = 28,993.32 × 11,578.80
  4. Step 4: Simplify right side
    21,010.20x = 335,707,853.62
  5. Step 5: Solve for x
    x = 335,707,853.62/21,010.20
  6. Step 6: Final answer
    x = 15,978.33

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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.