Home / 20,821.08-28,732.86-11,389.62

Finding the Fourth Proportional to 20,821.08, 28,732.86 and 11,389.62

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Solution

The fourth proportional to 20,821.08, 28,732.86 and 11,389.62 is: 15,717.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.08 : 28,732.86 = 11,389.62 : x
  2. Step 2: Convert to fraction form
    20,821.08/28,732.86 = 11,389.62/x
  3. Step 3: Cross multiply
    20,821.08x = 28,732.86 × 11,389.62
  4. Step 4: Simplify right side
    20,821.08x = 327,256,356.91
  5. Step 5: Solve for x
    x = 327,256,356.91/20,821.08
  6. Step 6: Final answer
    x = 15,717.55

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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.