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Finding the Fourth Proportional to 402.09, 602.79 and 219.31

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Solution

The fourth proportional to 402.09, 602.79 and 219.31 is: 328.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.09 : 602.79 = 219.31 : x
  2. Step 2: Convert to fraction form
    402.09/602.79 = 219.31/x
  3. Step 3: Cross multiply
    402.09x = 602.79 × 219.31
  4. Step 4: Simplify right side
    402.09x = 132,196.78
  5. Step 5: Solve for x
    x = 132,196.78/402.09
  6. Step 6: Final answer
    x = 328.77

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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.