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Finding the Fourth Proportional to 12,660, 18,991.08 and 3,426

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Solution

The fourth proportional to 12,660, 18,991.08 and 3,426 is: 5,139.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,660 : 18,991.08 = 3,426 : x
  2. Step 2: Convert to fraction form
    12,660/18,991.08 = 3,426/x
  3. Step 3: Cross multiply
    12,660x = 18,991.08 × 3,426
  4. Step 4: Simplify right side
    12,660x = 65,063,440.08
  5. Step 5: Solve for x
    x = 65,063,440.08/12,660
  6. Step 6: Final answer
    x = 5,139.29

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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.