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Finding the Fourth Proportional to 388.32, 582.78 and 205.77

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Solution

The fourth proportional to 388.32, 582.78 and 205.77 is: 308.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.32 : 582.78 = 205.77 : x
  2. Step 2: Convert to fraction form
    388.32/582.78 = 205.77/x
  3. Step 3: Cross multiply
    388.32x = 582.78 × 205.77
  4. Step 4: Simplify right side
    388.32x = 119,918.64
  5. Step 5: Solve for x
    x = 119,918.64/388.32
  6. Step 6: Final answer
    x = 308.81

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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.