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Finding the Fourth Proportional to 379.78, 524.12 and 211.74

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Solution

The fourth proportional to 379.78, 524.12 and 211.74 is: 292.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.78 : 524.12 = 211.74 : x
  2. Step 2: Convert to fraction form
    379.78/524.12 = 211.74/x
  3. Step 3: Cross multiply
    379.78x = 524.12 × 211.74
  4. Step 4: Simplify right side
    379.78x = 110,977.17
  5. Step 5: Solve for x
    x = 110,977.17/379.78
  6. Step 6: Final answer
    x = 292.21

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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.