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Finding the Fourth Proportional to 18,419.88, 25,419.78 and 10,972.20

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Solution

The fourth proportional to 18,419.88, 25,419.78 and 10,972.20 is: 15,141.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,419.88 : 25,419.78 = 10,972.20 : x
  2. Step 2: Convert to fraction form
    18,419.88/25,419.78 = 10,972.20/x
  3. Step 3: Cross multiply
    18,419.88x = 25,419.78 × 10,972.20
  4. Step 4: Simplify right side
    18,419.88x = 278,910,910.12
  5. Step 5: Solve for x
    x = 278,910,910.12/18,419.88
  6. Step 6: Final answer
    x = 15,141.84

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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.