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Finding the Fourth Proportional to 20,245.71, 27,939.19 and 11,171.40

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Solution

The fourth proportional to 20,245.71, 27,939.19 and 11,171.40 is: 15,416.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,245.71 : 27,939.19 = 11,171.40 : x
  2. Step 2: Convert to fraction form
    20,245.71/27,939.19 = 11,171.40/x
  3. Step 3: Cross multiply
    20,245.71x = 27,939.19 × 11,171.40
  4. Step 4: Simplify right side
    20,245.71x = 312,119,867.17
  5. Step 5: Solve for x
    x = 312,119,867.17/20,245.71
  6. Step 6: Final answer
    x = 15,416.59

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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.