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Finding the Fourth Proportional to 18,961.32, 28,439.64 and 8,431.56

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Solution

The fourth proportional to 18,961.32, 28,439.64 and 8,431.56 is: 12,646.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,961.32 : 28,439.64 = 8,431.56 : x
  2. Step 2: Convert to fraction form
    18,961.32/28,439.64 = 8,431.56/x
  3. Step 3: Cross multiply
    18,961.32x = 28,439.64 × 8,431.56
  4. Step 4: Simplify right side
    18,961.32x = 239,790,531.04
  5. Step 5: Solve for x
    x = 239,790,531.04/18,961.32
  6. Step 6: Final answer
    x = 12,646.30

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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.