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Finding the Fourth Proportional to 662.30, 991.69 and 401.95

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Solution

The fourth proportional to 662.30, 991.69 and 401.95 is: 601.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.30 : 991.69 = 401.95 : x
  2. Step 2: Convert to fraction form
    662.30/991.69 = 401.95/x
  3. Step 3: Cross multiply
    662.30x = 991.69 × 401.95
  4. Step 4: Simplify right side
    662.30x = 398,609.80
  5. Step 5: Solve for x
    x = 398,609.80/662.30
  6. Step 6: Final answer
    x = 601.86

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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.