Home / 20,821.21-28,733.96-11,389.78

Finding the Fourth Proportional to 20,821.21, 28,733.96 and 11,389.78

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Solution

The fourth proportional to 20,821.21, 28,733.96 and 11,389.78 is: 15,718.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.21 : 28,733.96 = 11,389.78 : x
  2. Step 2: Convert to fraction form
    20,821.21/28,733.96 = 11,389.78/x
  3. Step 3: Cross multiply
    20,821.21x = 28,733.96 × 11,389.78
  4. Step 4: Simplify right side
    20,821.21x = 327,273,482.93
  5. Step 5: Solve for x
    x = 327,273,482.93/20,821.21
  6. Step 6: Final answer
    x = 15,718.27

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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.