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Finding the Fourth Proportional to 388.22, 535.57 and 238.71

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Solution

The fourth proportional to 388.22, 535.57 and 238.71 is: 329.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.22 : 535.57 = 238.71 : x
  2. Step 2: Convert to fraction form
    388.22/535.57 = 238.71/x
  3. Step 3: Cross multiply
    388.22x = 535.57 × 238.71
  4. Step 4: Simplify right side
    388.22x = 127,845.91
  5. Step 5: Solve for x
    x = 127,845.91/388.22
  6. Step 6: Final answer
    x = 329.31

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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.