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Finding the Fourth Proportional to 19,687.80, 27,170.19 and 11,189.73

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Solution

The fourth proportional to 19,687.80, 27,170.19 and 11,189.73 is: 15,442.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,687.80 : 27,170.19 = 11,189.73 : x
  2. Step 2: Convert to fraction form
    19,687.80/27,170.19 = 11,189.73/x
  3. Step 3: Cross multiply
    19,687.80x = 27,170.19 × 11,189.73
  4. Step 4: Simplify right side
    19,687.80x = 304,027,090.15
  5. Step 5: Solve for x
    x = 304,027,090.15/19,687.80
  6. Step 6: Final answer
    x = 15,442.41

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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.