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Finding the Fourth Proportional to 386.40, 582.08 and 329.88

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Solution

The fourth proportional to 386.40, 582.08 and 329.88 is: 496.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.40 : 582.08 = 329.88 : x
  2. Step 2: Convert to fraction form
    386.40/582.08 = 329.88/x
  3. Step 3: Cross multiply
    386.40x = 582.08 × 329.88
  4. Step 4: Simplify right side
    386.40x = 192,016.55
  5. Step 5: Solve for x
    x = 192,016.55/386.40
  6. Step 6: Final answer
    x = 496.94

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.