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Finding the Fourth Proportional to 18,719.66, 28,078.41 and 11,322.13

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Solution

The fourth proportional to 18,719.66, 28,078.41 and 11,322.13 is: 16,982.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,719.66 : 28,078.41 = 11,322.13 : x
  2. Step 2: Convert to fraction form
    18,719.66/28,078.41 = 11,322.13/x
  3. Step 3: Cross multiply
    18,719.66x = 28,078.41 × 11,322.13
  4. Step 4: Simplify right side
    18,719.66x = 317,907,408.21
  5. Step 5: Solve for x
    x = 317,907,408.21/18,719.66
  6. Step 6: Final answer
    x = 16,982.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.