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Finding the Fourth Proportional to 339.92, 510.11 and 221.31

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Solution

The fourth proportional to 339.92, 510.11 and 221.31 is: 332.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.92 : 510.11 = 221.31 : x
  2. Step 2: Convert to fraction form
    339.92/510.11 = 221.31/x
  3. Step 3: Cross multiply
    339.92x = 510.11 × 221.31
  4. Step 4: Simplify right side
    339.92x = 112,892.44
  5. Step 5: Solve for x
    x = 112,892.44/339.92
  6. Step 6: Final answer
    x = 332.11

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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.