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Finding the Fourth Proportional to 8,991.44, 12,420.29 and 8,153.09

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Solution

The fourth proportional to 8,991.44, 12,420.29 and 8,153.09 is: 11,262.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,991.44 : 12,420.29 = 8,153.09 : x
  2. Step 2: Convert to fraction form
    8,991.44/12,420.29 = 8,153.09/x
  3. Step 3: Cross multiply
    8,991.44x = 12,420.29 × 8,153.09
  4. Step 4: Simplify right side
    8,991.44x = 101,263,747.05
  5. Step 5: Solve for x
    x = 101,263,747.05/8,991.44
  6. Step 6: Final answer
    x = 11,262.24

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Double scale
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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.