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Finding the Fourth Proportional to 381.29, 524.81 and 318.41

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Solution

The fourth proportional to 381.29, 524.81 and 318.41 is: 438.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.29 : 524.81 = 318.41 : x
  2. Step 2: Convert to fraction form
    381.29/524.81 = 318.41/x
  3. Step 3: Cross multiply
    381.29x = 524.81 × 318.41
  4. Step 4: Simplify right side
    381.29x = 167,104.75
  5. Step 5: Solve for x
    x = 167,104.75/381.29
  6. Step 6: Final answer
    x = 438.26

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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.