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Finding the Fourth Proportional to 18,947.22, 28,408.12 and 9,081.11

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Solution

The fourth proportional to 18,947.22, 28,408.12 and 9,081.11 is: 13,615.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,947.22 : 28,408.12 = 9,081.11 : x
  2. Step 2: Convert to fraction form
    18,947.22/28,408.12 = 9,081.11/x
  3. Step 3: Cross multiply
    18,947.22x = 28,408.12 × 9,081.11
  4. Step 4: Simplify right side
    18,947.22x = 257,977,310.93
  5. Step 5: Solve for x
    x = 257,977,310.93/18,947.22
  6. Step 6: Final answer
    x = 13,615.58

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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.