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Finding the Fourth Proportional to 12,961.87, 17,889.96 and 8,418.21

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Solution

The fourth proportional to 12,961.87, 17,889.96 and 8,418.21 is: 11,618.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,961.87 : 17,889.96 = 8,418.21 : x
  2. Step 2: Convert to fraction form
    12,961.87/17,889.96 = 8,418.21/x
  3. Step 3: Cross multiply
    12,961.87x = 17,889.96 × 8,418.21
  4. Step 4: Simplify right side
    12,961.87x = 150,601,434.25
  5. Step 5: Solve for x
    x = 150,601,434.25/12,961.87
  6. Step 6: Final answer
    x = 11,618.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.