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Finding the Fourth Proportional to 664.68, 998.55 and 418.65

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Solution

The fourth proportional to 664.68, 998.55 and 418.65 is: 628.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.68 : 998.55 = 418.65 : x
  2. Step 2: Convert to fraction form
    664.68/998.55 = 418.65/x
  3. Step 3: Cross multiply
    664.68x = 998.55 × 418.65
  4. Step 4: Simplify right side
    664.68x = 418,042.96
  5. Step 5: Solve for x
    x = 418,042.96/664.68
  6. Step 6: Final answer
    x = 628.94

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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.