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Finding the Fourth Proportional to 379.79, 569.68 and 217.61

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Solution

The fourth proportional to 379.79, 569.68 and 217.61 is: 326.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.79 : 569.68 = 217.61 : x
  2. Step 2: Convert to fraction form
    379.79/569.68 = 217.61/x
  3. Step 3: Cross multiply
    379.79x = 569.68 × 217.61
  4. Step 4: Simplify right side
    379.79x = 123,968.06
  5. Step 5: Solve for x
    x = 123,968.06/379.79
  6. Step 6: Final answer
    x = 326.41

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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.