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Finding the Fourth Proportional to 388.38, 535.96 and 211.34

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Solution

The fourth proportional to 388.38, 535.96 and 211.34 is: 291.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.38 : 535.96 = 211.34 : x
  2. Step 2: Convert to fraction form
    388.38/535.96 = 211.34/x
  3. Step 3: Cross multiply
    388.38x = 535.96 × 211.34
  4. Step 4: Simplify right side
    388.38x = 113,269.79
  5. Step 5: Solve for x
    x = 113,269.79/388.38
  6. Step 6: Final answer
    x = 291.65

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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.