Home / 20,821.05-28,732.82-11,389.50

Finding the Fourth Proportional to 20,821.05, 28,732.82 and 11,389.50

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Solution

The fourth proportional to 20,821.05, 28,732.82 and 11,389.50 is: 15,717.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.05 : 28,732.82 = 11,389.50 : x
  2. Step 2: Convert to fraction form
    20,821.05/28,732.82 = 11,389.50/x
  3. Step 3: Cross multiply
    20,821.05x = 28,732.82 × 11,389.50
  4. Step 4: Simplify right side
    20,821.05x = 327,252,396.44
  5. Step 5: Solve for x
    x = 327,252,396.44/20,821.05
  6. Step 6: Final answer
    x = 15,717.38

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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.