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Finding the Fourth Proportional to 662.20, 993.62 and 387.96

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Solution

The fourth proportional to 662.20, 993.62 and 387.96 is: 582.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.20 : 993.62 = 387.96 : x
  2. Step 2: Convert to fraction form
    662.20/993.62 = 387.96/x
  3. Step 3: Cross multiply
    662.20x = 993.62 × 387.96
  4. Step 4: Simplify right side
    662.20x = 385,484.82
  5. Step 5: Solve for x
    x = 385,484.82/662.20
  6. Step 6: Final answer
    x = 582.13

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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.