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Finding the Fourth Proportional to 278.89, 418.10 and 217.84

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Solution

The fourth proportional to 278.89, 418.10 and 217.84 is: 326.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.89 : 418.10 = 217.84 : x
  2. Step 2: Convert to fraction form
    278.89/418.10 = 217.84/x
  3. Step 3: Cross multiply
    278.89x = 418.10 × 217.84
  4. Step 4: Simplify right side
    278.89x = 91,076.81
  5. Step 5: Solve for x
    x = 91,076.81/278.89
  6. Step 6: Final answer
    x = 326.57

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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.