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Finding the Fourth Proportional to 379.28, 522 and 308.96

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Solution

The fourth proportional to 379.28, 522 and 308.96 is: 425.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.28 : 522 = 308.96 : x
  2. Step 2: Convert to fraction form
    379.28/522 = 308.96/x
  3. Step 3: Cross multiply
    379.28x = 522 × 308.96
  4. Step 4: Simplify right side
    379.28x = 161,277.12
  5. Step 5: Solve for x
    x = 161,277.12/379.28
  6. Step 6: Final answer
    x = 425.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.