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Finding the Fourth Proportional to 15,131.64, 20,880.99 and 8,757.21

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Solution

The fourth proportional to 15,131.64, 20,880.99 and 8,757.21 is: 12,084.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,131.64 : 20,880.99 = 8,757.21 : x
  2. Step 2: Convert to fraction form
    15,131.64/20,880.99 = 8,757.21/x
  3. Step 3: Cross multiply
    15,131.64x = 20,880.99 × 8,757.21
  4. Step 4: Simplify right side
    15,131.64x = 182,859,214.44
  5. Step 5: Solve for x
    x = 182,859,214.44/15,131.64
  6. Step 6: Final answer
    x = 12,084.56

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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.