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Finding the Fourth Proportional to 388.46, 535.99 and 231.15

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Solution

The fourth proportional to 388.46, 535.99 and 231.15 is: 318.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.46 : 535.99 = 231.15 : x
  2. Step 2: Convert to fraction form
    388.46/535.99 = 231.15/x
  3. Step 3: Cross multiply
    388.46x = 535.99 × 231.15
  4. Step 4: Simplify right side
    388.46x = 123,892.93
  5. Step 5: Solve for x
    x = 123,892.93/388.46
  6. Step 6: Final answer
    x = 318.94

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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.