Home / 20,820.82-28,732.76-11,389.38

Finding the Fourth Proportional to 20,820.82, 28,732.76 and 11,389.38

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Solution

The fourth proportional to 20,820.82, 28,732.76 and 11,389.38 is: 15,717.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.82 : 28,732.76 = 11,389.38 : x
  2. Step 2: Convert to fraction form
    20,820.82/28,732.76 = 11,389.38/x
  3. Step 3: Cross multiply
    20,820.82x = 28,732.76 × 11,389.38
  4. Step 4: Simplify right side
    20,820.82x = 327,248,322.09
  5. Step 5: Solve for x
    x = 327,248,322.09/20,820.82
  6. Step 6: Final answer
    x = 15,717.36

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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.