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Finding the Fourth Proportional to 429.22, 644.13 and 321.29

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Solution

The fourth proportional to 429.22, 644.13 and 321.29 is: 482.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.22 : 644.13 = 321.29 : x
  2. Step 2: Convert to fraction form
    429.22/644.13 = 321.29/x
  3. Step 3: Cross multiply
    429.22x = 644.13 × 321.29
  4. Step 4: Simplify right side
    429.22x = 206,952.53
  5. Step 5: Solve for x
    x = 206,952.53/429.22
  6. Step 6: Final answer
    x = 482.17

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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.