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Finding the Fourth Proportional to 21,149.75, 31,721.18 and 7,998.99

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Solution

The fourth proportional to 21,149.75, 31,721.18 and 7,998.99 is: 11,997.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,149.75 : 31,721.18 = 7,998.99 : x
  2. Step 2: Convert to fraction form
    21,149.75/31,721.18 = 7,998.99/x
  3. Step 3: Cross multiply
    21,149.75x = 31,721.18 × 7,998.99
  4. Step 4: Simplify right side
    21,149.75x = 253,737,361.61
  5. Step 5: Solve for x
    x = 253,737,361.61/21,149.75
  6. Step 6: Final answer
    x = 11,997.18

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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.