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Finding the Fourth Proportional to 388.39, 535.97 and 211.35

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Solution

The fourth proportional to 388.39, 535.97 and 211.35 is: 291.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.39 : 535.97 = 211.35 : x
  2. Step 2: Convert to fraction form
    388.39/535.97 = 211.35/x
  3. Step 3: Cross multiply
    388.39x = 535.97 × 211.35
  4. Step 4: Simplify right side
    388.39x = 113,275.45
  5. Step 5: Solve for x
    x = 113,275.45/388.39
  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.