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Finding the Fourth Proportional to 27,709.80, 38,190.09 and 20,979.31

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Solution

The fourth proportional to 27,709.80, 38,190.09 and 20,979.31 is: 28,914.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,709.80 : 38,190.09 = 20,979.31 : x
  2. Step 2: Convert to fraction form
    27,709.80/38,190.09 = 20,979.31/x
  3. Step 3: Cross multiply
    27,709.80x = 38,190.09 × 20,979.31
  4. Step 4: Simplify right side
    27,709.80x = 801,201,737.04
  5. Step 5: Solve for x
    x = 801,201,737.04/27,709.80
  6. Step 6: Final answer
    x = 28,914.02

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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.