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Finding the Fourth Proportional to 387.78, 582.21 and 205.26

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Solution

The fourth proportional to 387.78, 582.21 and 205.26 is: 308.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.78 : 582.21 = 205.26 : x
  2. Step 2: Convert to fraction form
    387.78/582.21 = 205.26/x
  3. Step 3: Cross multiply
    387.78x = 582.21 × 205.26
  4. Step 4: Simplify right side
    387.78x = 119,504.42
  5. Step 5: Solve for x
    x = 119,504.42/387.78
  6. Step 6: Final answer
    x = 308.18

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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.