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Finding the Fourth Proportional to 387.69, 582.63 and 205.23

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Solution

The fourth proportional to 387.69, 582.63 and 205.23 is: 308.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.69 : 582.63 = 205.23 : x
  2. Step 2: Convert to fraction form
    387.69/582.63 = 205.23/x
  3. Step 3: Cross multiply
    387.69x = 582.63 × 205.23
  4. Step 4: Simplify right side
    387.69x = 119,573.15
  5. Step 5: Solve for x
    x = 119,573.15/387.69
  6. Step 6: Final answer
    x = 308.42

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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.