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Finding the Fourth Proportional to 20,906.80, 28,861.20 and 14,019.69

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Solution

The fourth proportional to 20,906.80, 28,861.20 and 14,019.69 is: 19,353.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,906.80 : 28,861.20 = 14,019.69 : x
  2. Step 2: Convert to fraction form
    20,906.80/28,861.20 = 14,019.69/x
  3. Step 3: Cross multiply
    20,906.80x = 28,861.20 × 14,019.69
  4. Step 4: Simplify right side
    20,906.80x = 404,625,077.03
  5. Step 5: Solve for x
    x = 404,625,077.03/20,906.80
  6. Step 6: Final answer
    x = 19,353.75

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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.