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Finding the Fourth Proportional to 11,115.90, 16,659.45 and 9,819.90

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Solution

The fourth proportional to 11,115.90, 16,659.45 and 9,819.90 is: 14,717.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,115.90 : 16,659.45 = 9,819.90 : x
  2. Step 2: Convert to fraction form
    11,115.90/16,659.45 = 9,819.90/x
  3. Step 3: Cross multiply
    11,115.90x = 16,659.45 × 9,819.90
  4. Step 4: Simplify right side
    11,115.90x = 163,594,133.06
  5. Step 5: Solve for x
    x = 163,594,133.06/11,115.90
  6. Step 6: Final answer
    x = 14,717.13

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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.