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Finding the Fourth Proportional to 13,801.74, 20,689.11 and 5,478.99

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Solution

The fourth proportional to 13,801.74, 20,689.11 and 5,478.99 is: 8,213.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,801.74 : 20,689.11 = 5,478.99 : x
  2. Step 2: Convert to fraction form
    13,801.74/20,689.11 = 5,478.99/x
  3. Step 3: Cross multiply
    13,801.74x = 20,689.11 × 5,478.99
  4. Step 4: Simplify right side
    13,801.74x = 113,355,426.80
  5. Step 5: Solve for x
    x = 113,355,426.80/13,801.74
  6. Step 6: Final answer
    x = 8,213.13

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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.