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Finding the Fourth Proportional to 12,078, 18,117 and 3,870

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Solution

The fourth proportional to 12,078, 18,117 and 3,870 is: 5,805

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,078 : 18,117 = 3,870 : x
  2. Step 2: Convert to fraction form
    12,078/18,117 = 3,870/x
  3. Step 3: Cross multiply
    12,078x = 18,117 × 3,870
  4. Step 4: Simplify right side
    12,078x = 70,112,790
  5. Step 5: Solve for x
    x = 70,112,790/12,078
  6. Step 6: Final answer
    x = 5,805

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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.