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Finding the Fourth Proportional to 381.72, 571.50 and 308.16

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Solution

The fourth proportional to 381.72, 571.50 and 308.16 is: 461.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.72 : 571.50 = 308.16 : x
  2. Step 2: Convert to fraction form
    381.72/571.50 = 308.16/x
  3. Step 3: Cross multiply
    381.72x = 571.50 × 308.16
  4. Step 4: Simplify right side
    381.72x = 176,113.44
  5. Step 5: Solve for x
    x = 176,113.44/381.72
  6. Step 6: Final answer
    x = 461.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.