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Finding the Fourth Proportional to 429.46, 643.61 and 223.61

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Solution

The fourth proportional to 429.46, 643.61 and 223.61 is: 335.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.46 : 643.61 = 223.61 : x
  2. Step 2: Convert to fraction form
    429.46/643.61 = 223.61/x
  3. Step 3: Cross multiply
    429.46x = 643.61 × 223.61
  4. Step 4: Simplify right side
    429.46x = 143,914.97
  5. Step 5: Solve for x
    x = 143,914.97/429.46
  6. Step 6: Final answer
    x = 335.11

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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.