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Finding the Fourth Proportional to 381.49, 525.97 and 311.48

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Solution

The fourth proportional to 381.49, 525.97 and 311.48 is: 429.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.49 : 525.97 = 311.48 : x
  2. Step 2: Convert to fraction form
    381.49/525.97 = 311.48/x
  3. Step 3: Cross multiply
    381.49x = 525.97 × 311.48
  4. Step 4: Simplify right side
    381.49x = 163,827.58
  5. Step 5: Solve for x
    x = 163,827.58/381.49
  6. Step 6: Final answer
    x = 429.44

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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.