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Finding the Fourth Proportional to 13,600.31, 20,393.78 and 7,979.41

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Solution

The fourth proportional to 13,600.31, 20,393.78 and 7,979.41 is: 11,965.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,600.31 : 20,393.78 = 7,979.41 : x
  2. Step 2: Convert to fraction form
    13,600.31/20,393.78 = 7,979.41/x
  3. Step 3: Cross multiply
    13,600.31x = 20,393.78 × 7,979.41
  4. Step 4: Simplify right side
    13,600.31x = 162,730,317.66
  5. Step 5: Solve for x
    x = 162,730,317.66/13,600.31
  6. Step 6: Final answer
    x = 11,965.20

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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.