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Finding the Fourth Proportional to 12,720, 19,081.32 and 3,486

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Solution

The fourth proportional to 12,720, 19,081.32 and 3,486 is: 5,229.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,720 : 19,081.32 = 3,486 : x
  2. Step 2: Convert to fraction form
    12,720/19,081.32 = 3,486/x
  3. Step 3: Cross multiply
    12,720x = 19,081.32 × 3,486
  4. Step 4: Simplify right side
    12,720x = 66,517,481.52
  5. Step 5: Solve for x
    x = 66,517,481.52/12,720
  6. Step 6: Final answer
    x = 5,229.36

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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.