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Finding the Fourth Proportional to 1,819.31, 2,728.16 and 664.25

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Solution

The fourth proportional to 1,819.31, 2,728.16 and 664.25 is: 996.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,819.31 : 2,728.16 = 664.25 : x
  2. Step 2: Convert to fraction form
    1,819.31/2,728.16 = 664.25/x
  3. Step 3: Cross multiply
    1,819.31x = 2,728.16 × 664.25
  4. Step 4: Simplify right side
    1,819.31x = 1,812,176.96
  5. Step 5: Solve for x
    x = 1,812,176.96/1,819.31
  6. Step 6: Final answer
    x = 996.08

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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.