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Finding the Fourth Proportional to 662.48, 993.73 and 315.85

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Solution

The fourth proportional to 662.48, 993.73 and 315.85 is: 473.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.48 : 993.73 = 315.85 : x
  2. Step 2: Convert to fraction form
    662.48/993.73 = 315.85/x
  3. Step 3: Cross multiply
    662.48x = 993.73 × 315.85
  4. Step 4: Simplify right side
    662.48x = 313,869.62
  5. Step 5: Solve for x
    x = 313,869.62/662.48
  6. Step 6: Final answer
    x = 473.78

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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.