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Finding the Fourth Proportional to 13,859.78, 20,794.83 and 8,317.10

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Solution

The fourth proportional to 13,859.78, 20,794.83 and 8,317.10 is: 12,478.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,859.78 : 20,794.83 = 8,317.10 : x
  2. Step 2: Convert to fraction form
    13,859.78/20,794.83 = 8,317.10/x
  3. Step 3: Cross multiply
    13,859.78x = 20,794.83 × 8,317.10
  4. Step 4: Simplify right side
    13,859.78x = 172,952,680.59
  5. Step 5: Solve for x
    x = 172,952,680.59/13,859.78
  6. Step 6: Final answer
    x = 12,478.75

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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.