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Finding the Fourth Proportional to 11,809.40, 17,714.10 and 3,911.90

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Solution

The fourth proportional to 11,809.40, 17,714.10 and 3,911.90 is: 5,867.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,809.40 : 17,714.10 = 3,911.90 : x
  2. Step 2: Convert to fraction form
    11,809.40/17,714.10 = 3,911.90/x
  3. Step 3: Cross multiply
    11,809.40x = 17,714.10 × 3,911.90
  4. Step 4: Simplify right side
    11,809.40x = 69,295,787.79
  5. Step 5: Solve for x
    x = 69,295,787.79/11,809.40
  6. Step 6: Final answer
    x = 5,867.85

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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.