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Finding the Fourth Proportional to 331.20, 497.17 and 209.53

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Solution

The fourth proportional to 331.20, 497.17 and 209.53 is: 314.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.20 : 497.17 = 209.53 : x
  2. Step 2: Convert to fraction form
    331.20/497.17 = 209.53/x
  3. Step 3: Cross multiply
    331.20x = 497.17 × 209.53
  4. Step 4: Simplify right side
    331.20x = 104,172.91
  5. Step 5: Solve for x
    x = 104,172.91/331.20
  6. Step 6: Final answer
    x = 314.53

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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.