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Finding the Fourth Proportional to 628.98, 943.12 and 217.99

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Solution

The fourth proportional to 628.98, 943.12 and 217.99 is: 326.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.98 : 943.12 = 217.99 : x
  2. Step 2: Convert to fraction form
    628.98/943.12 = 217.99/x
  3. Step 3: Cross multiply
    628.98x = 943.12 × 217.99
  4. Step 4: Simplify right side
    628.98x = 205,590.73
  5. Step 5: Solve for x
    x = 205,590.73/628.98
  6. Step 6: Final answer
    x = 326.86

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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.