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Finding the Fourth Proportional to 386.28, 531.71 and 323.42

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Solution

The fourth proportional to 386.28, 531.71 and 323.42 is: 445.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.28 : 531.71 = 323.42 : x
  2. Step 2: Convert to fraction form
    386.28/531.71 = 323.42/x
  3. Step 3: Cross multiply
    386.28x = 531.71 × 323.42
  4. Step 4: Simplify right side
    386.28x = 171,961.37
  5. Step 5: Solve for x
    x = 171,961.37/386.28
  6. Step 6: Final answer
    x = 445.17

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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.