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Finding the Fourth Proportional to 387.75, 535.14 and 271.56

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Solution

The fourth proportional to 387.75, 535.14 and 271.56 is: 374.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.75 : 535.14 = 271.56 : x
  2. Step 2: Convert to fraction form
    387.75/535.14 = 271.56/x
  3. Step 3: Cross multiply
    387.75x = 535.14 × 271.56
  4. Step 4: Simplify right side
    387.75x = 145,322.62
  5. Step 5: Solve for x
    x = 145,322.62/387.75
  6. Step 6: Final answer
    x = 374.78

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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.