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Finding the Fourth Proportional to 11,996.80, 16,556.80 and 7,218.24

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Solution

The fourth proportional to 11,996.80, 16,556.80 and 7,218.24 is: 9,961.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,996.80 : 16,556.80 = 7,218.24 : x
  2. Step 2: Convert to fraction form
    11,996.80/16,556.80 = 7,218.24/x
  3. Step 3: Cross multiply
    11,996.80x = 16,556.80 × 7,218.24
  4. Step 4: Simplify right side
    11,996.80x = 119,510,956.03
  5. Step 5: Solve for x
    x = 119,510,956.03/11,996.80
  6. Step 6: Final answer
    x = 9,961.90

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.