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Finding the Fourth Proportional to 11,911.90, 17,868.02 and 8,213.14

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Solution

The fourth proportional to 11,911.90, 17,868.02 and 8,213.14 is: 12,319.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,911.90 : 17,868.02 = 8,213.14 : x
  2. Step 2: Convert to fraction form
    11,911.90/17,868.02 = 8,213.14/x
  3. Step 3: Cross multiply
    11,911.90x = 17,868.02 × 8,213.14
  4. Step 4: Simplify right side
    11,911.90x = 146,752,549.78
  5. Step 5: Solve for x
    x = 146,752,549.78/11,911.90
  6. Step 6: Final answer
    x = 12,319.83

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1.5x scale

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.