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Finding the Fourth Proportional to 378.49, 521.97 and 339.76

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Solution

The fourth proportional to 378.49, 521.97 and 339.76 is: 468.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.49 : 521.97 = 339.76 : x
  2. Step 2: Convert to fraction form
    378.49/521.97 = 339.76/x
  3. Step 3: Cross multiply
    378.49x = 521.97 × 339.76
  4. Step 4: Simplify right side
    378.49x = 177,341.92
  5. Step 5: Solve for x
    x = 177,341.92/378.49
  6. Step 6: Final answer
    x = 468.56

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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.