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Finding the Fourth Proportional to 388.07, 535.47 and 238.65

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Solution

The fourth proportional to 388.07, 535.47 and 238.65 is: 329.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.07 : 535.47 = 238.65 : x
  2. Step 2: Convert to fraction form
    388.07/535.47 = 238.65/x
  3. Step 3: Cross multiply
    388.07x = 535.47 × 238.65
  4. Step 4: Simplify right side
    388.07x = 127,788.80
  5. Step 5: Solve for x
    x = 127,788.80/388.07
  6. Step 6: Final answer
    x = 329.29

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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.