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Finding the Fourth Proportional to 662.30, 992.85 and 272.21

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Solution

The fourth proportional to 662.30, 992.85 and 272.21 is: 408.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.30 : 992.85 = 272.21 : x
  2. Step 2: Convert to fraction form
    662.30/992.85 = 272.21/x
  3. Step 3: Cross multiply
    662.30x = 992.85 × 272.21
  4. Step 4: Simplify right side
    662.30x = 270,263.70
  5. Step 5: Solve for x
    x = 270,263.70/662.30
  6. Step 6: Final answer
    x = 408.07

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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.