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Finding the Fourth Proportional to 18,687.21, 25,789.62 and 11,422.42

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Solution

The fourth proportional to 18,687.21, 25,789.62 and 11,422.42 is: 15,763.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,687.21 : 25,789.62 = 11,422.42 : x
  2. Step 2: Convert to fraction form
    18,687.21/25,789.62 = 11,422.42/x
  3. Step 3: Cross multiply
    18,687.21x = 25,789.62 × 11,422.42
  4. Step 4: Simplify right side
    18,687.21x = 294,579,871.28
  5. Step 5: Solve for x
    x = 294,579,871.28/18,687.21
  6. Step 6: Final answer
    x = 15,763.72

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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.