Home / 20,820.66-28,732.46-11,389.22

Finding the Fourth Proportional to 20,820.66, 28,732.46 and 11,389.22

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Solution

The fourth proportional to 20,820.66, 28,732.46 and 11,389.22 is: 15,717.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.66 : 28,732.46 = 11,389.22 : x
  2. Step 2: Convert to fraction form
    20,820.66/28,732.46 = 11,389.22/x
  3. Step 3: Cross multiply
    20,820.66x = 28,732.46 × 11,389.22
  4. Step 4: Simplify right side
    20,820.66x = 327,240,308.08
  5. Step 5: Solve for x
    x = 327,240,308.08/20,820.66
  6. Step 6: Final answer
    x = 15,717.10

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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.