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Finding the Fourth Proportional to 381.13, 525.91 and 256.75

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Solution

The fourth proportional to 381.13, 525.91 and 256.75 is: 354.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.13 : 525.91 = 256.75 : x
  2. Step 2: Convert to fraction form
    381.13/525.91 = 256.75/x
  3. Step 3: Cross multiply
    381.13x = 525.91 × 256.75
  4. Step 4: Simplify right side
    381.13x = 135,027.39
  5. Step 5: Solve for x
    x = 135,027.39/381.13
  6. Step 6: Final answer
    x = 354.28

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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.