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Finding the Fourth Proportional to 9,997.92, 13,813.20 and 8,521.44

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Solution

The fourth proportional to 9,997.92, 13,813.20 and 8,521.44 is: 11,773.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,997.92 : 13,813.20 = 8,521.44 : x
  2. Step 2: Convert to fraction form
    9,997.92/13,813.20 = 8,521.44/x
  3. Step 3: Cross multiply
    9,997.92x = 13,813.20 × 8,521.44
  4. Step 4: Simplify right side
    9,997.92x = 117,708,355.01
  5. Step 5: Solve for x
    x = 117,708,355.01/9,997.92
  6. Step 6: Final answer
    x = 11,773.28

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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.