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Finding the Fourth Proportional to 379.84, 523.10 and 378.62

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Solution

The fourth proportional to 379.84, 523.10 and 378.62 is: 521.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.84 : 523.10 = 378.62 : x
  2. Step 2: Convert to fraction form
    379.84/523.10 = 378.62/x
  3. Step 3: Cross multiply
    379.84x = 523.10 × 378.62
  4. Step 4: Simplify right side
    379.84x = 198,056.12
  5. Step 5: Solve for x
    x = 198,056.12/379.84
  6. Step 6: Final answer
    x = 521.42

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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.