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Finding the Fourth Proportional to 11,999.20, 17,998.80 and 6,815.20

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Solution

The fourth proportional to 11,999.20, 17,998.80 and 6,815.20 is: 10,222.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,999.20 : 17,998.80 = 6,815.20 : x
  2. Step 2: Convert to fraction form
    11,999.20/17,998.80 = 6,815.20/x
  3. Step 3: Cross multiply
    11,999.20x = 17,998.80 × 6,815.20
  4. Step 4: Simplify right side
    11,999.20x = 122,665,421.76
  5. Step 5: Solve for x
    x = 122,665,421.76/11,999.20
  6. Step 6: Final answer
    x = 10,222.80

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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.