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Finding the Fourth Proportional to 13,921.20, 20,853.95 and 8,371.48

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Solution

The fourth proportional to 13,921.20, 20,853.95 and 8,371.48 is: 12,540.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,921.20 : 20,853.95 = 8,371.48 : x
  2. Step 2: Convert to fraction form
    13,921.20/20,853.95 = 8,371.48/x
  3. Step 3: Cross multiply
    13,921.20x = 20,853.95 × 8,371.48
  4. Step 4: Simplify right side
    13,921.20x = 174,578,425.35
  5. Step 5: Solve for x
    x = 174,578,425.35/13,921.20
  6. Step 6: Final answer
    x = 12,540.47

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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.