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Finding the Fourth Proportional to 18,805.21, 25,942 and 15,819.95

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Solution

The fourth proportional to 18,805.21, 25,942 and 15,819.95 is: 21,823.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,805.21 : 25,942 = 15,819.95 : x
  2. Step 2: Convert to fraction form
    18,805.21/25,942 = 15,819.95/x
  3. Step 3: Cross multiply
    18,805.21x = 25,942 × 15,819.95
  4. Step 4: Simplify right side
    18,805.21x = 410,401,142.90
  5. Step 5: Solve for x
    x = 410,401,142.90/18,805.21
  6. Step 6: Final answer
    x = 21,823.80

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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.