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Finding the Fourth Proportional to 2,147, 3,220.62 and 608.12

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Solution

The fourth proportional to 2,147, 3,220.62 and 608.12 is: 912.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,147 : 3,220.62 = 608.12 : x
  2. Step 2: Convert to fraction form
    2,147/3,220.62 = 608.12/x
  3. Step 3: Cross multiply
    2,147x = 3,220.62 × 608.12
  4. Step 4: Simplify right side
    2,147x = 1,958,523.43
  5. Step 5: Solve for x
    x = 1,958,523.43/2,147
  6. Step 6: Final answer
    x = 912.21

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Double scale
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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.