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Finding the Fourth Proportional to 18,615.76, 25,695.73 and 11,919.42

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Solution

The fourth proportional to 18,615.76, 25,695.73 and 11,919.42 is: 16,452.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,615.76 : 25,695.73 = 11,919.42 : x
  2. Step 2: Convert to fraction form
    18,615.76/25,695.73 = 11,919.42/x
  3. Step 3: Cross multiply
    18,615.76x = 25,695.73 × 11,919.42
  4. Step 4: Simplify right side
    18,615.76x = 306,278,212.98
  5. Step 5: Solve for x
    x = 306,278,212.98/18,615.76
  6. Step 6: Final answer
    x = 16,452.63

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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.