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Finding the Fourth Proportional to 402.79, 604.02 and 217.60

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Solution

The fourth proportional to 402.79, 604.02 and 217.60 is: 326.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.79 : 604.02 = 217.60 : x
  2. Step 2: Convert to fraction form
    402.79/604.02 = 217.60/x
  3. Step 3: Cross multiply
    402.79x = 604.02 × 217.60
  4. Step 4: Simplify right side
    402.79x = 131,437.46
  5. Step 5: Solve for x
    x = 131,437.46/402.79
  6. Step 6: Final answer
    x = 326.32

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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.