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Finding the Fourth Proportional to 11,321.64, 15,618.42 and 8,799.30

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Solution

The fourth proportional to 11,321.64, 15,618.42 and 8,799.30 is: 12,138.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,321.64 : 15,618.42 = 8,799.30 : x
  2. Step 2: Convert to fraction form
    11,321.64/15,618.42 = 8,799.30/x
  3. Step 3: Cross multiply
    11,321.64x = 15,618.42 × 8,799.30
  4. Step 4: Simplify right side
    11,321.64x = 137,431,163.11
  5. Step 5: Solve for x
    x = 137,431,163.11/11,321.64
  6. Step 6: Final answer
    x = 12,138.80

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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.