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Finding the Fourth Proportional to 12,422.91, 18,634.37 and 8,515.47

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Solution

The fourth proportional to 12,422.91, 18,634.37 and 8,515.47 is: 12,773.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,422.91 : 18,634.37 = 8,515.47 : x
  2. Step 2: Convert to fraction form
    12,422.91/18,634.37 = 8,515.47/x
  3. Step 3: Cross multiply
    12,422.91x = 18,634.37 × 8,515.47
  4. Step 4: Simplify right side
    12,422.91x = 158,680,376.13
  5. Step 5: Solve for x
    x = 158,680,376.13/12,422.91
  6. Step 6: Final answer
    x = 12,773.21

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Similar ratio
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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.