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Finding the Fourth Proportional to 254.33, 379.36 and 220.31

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Solution

The fourth proportional to 254.33, 379.36 and 220.31 is: 328.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.33 : 379.36 = 220.31 : x
  2. Step 2: Convert to fraction form
    254.33/379.36 = 220.31/x
  3. Step 3: Cross multiply
    254.33x = 379.36 × 220.31
  4. Step 4: Simplify right side
    254.33x = 83,576.80
  5. Step 5: Solve for x
    x = 83,576.80/254.33
  6. Step 6: Final answer
    x = 328.62

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.