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Finding the Fourth Proportional to 379.59, 522.77 and 378.39

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Solution

The fourth proportional to 379.59, 522.77 and 378.39 is: 521.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.59 : 522.77 = 378.39 : x
  2. Step 2: Convert to fraction form
    379.59/522.77 = 378.39/x
  3. Step 3: Cross multiply
    379.59x = 522.77 × 378.39
  4. Step 4: Simplify right side
    379.59x = 197,809.05
  5. Step 5: Solve for x
    x = 197,809.05/379.59
  6. Step 6: Final answer
    x = 521.11

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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.