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Finding the Fourth Proportional to 8,998.72, 12,411.20 and 7,991.44

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Solution

The fourth proportional to 8,998.72, 12,411.20 and 7,991.44 is: 11,021.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,998.72 : 12,411.20 = 7,991.44 : x
  2. Step 2: Convert to fraction form
    8,998.72/12,411.20 = 7,991.44/x
  3. Step 3: Cross multiply
    8,998.72x = 12,411.20 × 7,991.44
  4. Step 4: Simplify right side
    8,998.72x = 99,183,360.13
  5. Step 5: Solve for x
    x = 99,183,360.13/8,998.72
  6. Step 6: Final answer
    x = 11,021.94

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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.