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Finding the Fourth Proportional to 386.72, 580.24 and 213.17

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Solution

The fourth proportional to 386.72, 580.24 and 213.17 is: 319.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.72 : 580.24 = 213.17 : x
  2. Step 2: Convert to fraction form
    386.72/580.24 = 213.17/x
  3. Step 3: Cross multiply
    386.72x = 580.24 × 213.17
  4. Step 4: Simplify right side
    386.72x = 123,689.76
  5. Step 5: Solve for x
    x = 123,689.76/386.72
  6. Step 6: Final answer
    x = 319.85

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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.