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Finding the Fourth Proportional to 18,741.10, 28,107.60 and 8,211.10

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Solution

The fourth proportional to 18,741.10, 28,107.60 and 8,211.10 is: 12,314.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,741.10 : 28,107.60 = 8,211.10 : x
  2. Step 2: Convert to fraction form
    18,741.10/28,107.60 = 8,211.10/x
  3. Step 3: Cross multiply
    18,741.10x = 28,107.60 × 8,211.10
  4. Step 4: Simplify right side
    18,741.10x = 230,794,314.36
  5. Step 5: Solve for x
    x = 230,794,314.36/18,741.10
  6. Step 6: Final answer
    x = 12,314.88

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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.