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Finding the Fourth Proportional to 18,691.75, 25,788.14 and 11,981.07

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Solution

The fourth proportional to 18,691.75, 25,788.14 and 11,981.07 is: 16,529.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,691.75 : 25,788.14 = 11,981.07 : x
  2. Step 2: Convert to fraction form
    18,691.75/25,788.14 = 11,981.07/x
  3. Step 3: Cross multiply
    18,691.75x = 25,788.14 × 11,981.07
  4. Step 4: Simplify right side
    18,691.75x = 308,969,495.53
  5. Step 5: Solve for x
    x = 308,969,495.53/18,691.75
  6. Step 6: Final answer
    x = 16,529.73

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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.