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Finding the Fourth Proportional to 379.13, 523.55 and 285.72

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Solution

The fourth proportional to 379.13, 523.55 and 285.72 is: 394.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.13 : 523.55 = 285.72 : x
  2. Step 2: Convert to fraction form
    379.13/523.55 = 285.72/x
  3. Step 3: Cross multiply
    379.13x = 523.55 × 285.72
  4. Step 4: Simplify right side
    379.13x = 149,584.66
  5. Step 5: Solve for x
    x = 149,584.66/379.13
  6. Step 6: Final answer
    x = 394.55

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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.