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Finding the Fourth Proportional to 20,131.70, 27,781.80 and 11,179.22

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Solution

The fourth proportional to 20,131.70, 27,781.80 and 11,179.22 is: 15,427.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,131.70 : 27,781.80 = 11,179.22 : x
  2. Step 2: Convert to fraction form
    20,131.70/27,781.80 = 11,179.22/x
  3. Step 3: Cross multiply
    20,131.70x = 27,781.80 × 11,179.22
  4. Step 4: Simplify right side
    20,131.70x = 310,578,854.20
  5. Step 5: Solve for x
    x = 310,578,854.20/20,131.70
  6. Step 6: Final answer
    x = 15,427.35

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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.