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Finding the Fourth Proportional to 12,665.31, 18,997.97 and 7,725.08

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Solution

The fourth proportional to 12,665.31, 18,997.97 and 7,725.08 is: 11,587.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,665.31 : 18,997.97 = 7,725.08 : x
  2. Step 2: Convert to fraction form
    12,665.31/18,997.97 = 7,725.08/x
  3. Step 3: Cross multiply
    12,665.31x = 18,997.97 × 7,725.08
  4. Step 4: Simplify right side
    12,665.31x = 146,760,704.47
  5. Step 5: Solve for x
    x = 146,760,704.47/12,665.31
  6. Step 6: Final answer
    x = 11,587.61

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.