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Finding the Fourth Proportional to 18,405, 25,399 and 10,021.50

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Solution

The fourth proportional to 18,405, 25,399 and 10,021.50 is: 13,829.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,405 : 25,399 = 10,021.50 : x
  2. Step 2: Convert to fraction form
    18,405/25,399 = 10,021.50/x
  3. Step 3: Cross multiply
    18,405x = 25,399 × 10,021.50
  4. Step 4: Simplify right side
    18,405x = 254,536,078.50
  5. Step 5: Solve for x
    x = 254,536,078.50/18,405
  6. Step 6: Final answer
    x = 13,829.72

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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.