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Finding the Fourth Proportional to 18,696.39, 27,978.76 and 11,679.71

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Solution

The fourth proportional to 18,696.39, 27,978.76 and 11,679.71 is: 17,478.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,696.39 : 27,978.76 = 11,679.71 : x
  2. Step 2: Convert to fraction form
    18,696.39/27,978.76 = 11,679.71/x
  3. Step 3: Cross multiply
    18,696.39x = 27,978.76 × 11,679.71
  4. Step 4: Simplify right side
    18,696.39x = 326,783,802.96
  5. Step 5: Solve for x
    x = 326,783,802.96/18,696.39
  6. Step 6: Final answer
    x = 17,478.44

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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.