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Finding the Fourth Proportional to 13,805.80, 20,711.40 and 5,908.30

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Solution

The fourth proportional to 13,805.80, 20,711.40 and 5,908.30 is: 8,863.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,805.80 : 20,711.40 = 5,908.30 : x
  2. Step 2: Convert to fraction form
    13,805.80/20,711.40 = 5,908.30/x
  3. Step 3: Cross multiply
    13,805.80x = 20,711.40 × 5,908.30
  4. Step 4: Simplify right side
    13,805.80x = 122,369,164.62
  5. Step 5: Solve for x
    x = 122,369,164.62/13,805.80
  6. Step 6: Final answer
    x = 8,863.61

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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.