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Finding the Fourth Proportional to 18,135, 25,020 and 11,421.18

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Solution

The fourth proportional to 18,135, 25,020 and 11,421.18 is: 15,757.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,135 : 25,020 = 11,421.18 : x
  2. Step 2: Convert to fraction form
    18,135/25,020 = 11,421.18/x
  3. Step 3: Cross multiply
    18,135x = 25,020 × 11,421.18
  4. Step 4: Simplify right side
    18,135x = 285,757,923.60
  5. Step 5: Solve for x
    x = 285,757,923.60/18,135
  6. Step 6: Final answer
    x = 15,757.26

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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.