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Finding the Fourth Proportional to 388.20, 535.66 and 248.44

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Solution

The fourth proportional to 388.20, 535.66 and 248.44 is: 342.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.20 : 535.66 = 248.44 : x
  2. Step 2: Convert to fraction form
    388.20/535.66 = 248.44/x
  3. Step 3: Cross multiply
    388.20x = 535.66 × 248.44
  4. Step 4: Simplify right side
    388.20x = 133,079.37
  5. Step 5: Solve for x
    x = 133,079.37/388.20
  6. Step 6: Final answer
    x = 342.81

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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.