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Finding the Fourth Proportional to 18,696.45, 27,978.83 and 11,679.76

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Solution

The fourth proportional to 18,696.45, 27,978.83 and 11,679.76 is: 17,478.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,696.45 : 27,978.83 = 11,679.76 : x
  2. Step 2: Convert to fraction form
    18,696.45/27,978.83 = 11,679.76/x
  3. Step 3: Cross multiply
    18,696.45x = 27,978.83 × 11,679.76
  4. Step 4: Simplify right side
    18,696.45x = 326,786,039.85
  5. Step 5: Solve for x
    x = 326,786,039.85/18,696.45
  6. Step 6: Final answer
    x = 17,478.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.