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Finding the Fourth Proportional to 388.75, 582.13 and 205.74

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Solution

The fourth proportional to 388.75, 582.13 and 205.74 is: 308.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.75 : 582.13 = 205.74 : x
  2. Step 2: Convert to fraction form
    388.75/582.13 = 205.74/x
  3. Step 3: Cross multiply
    388.75x = 582.13 × 205.74
  4. Step 4: Simplify right side
    388.75x = 119,767.43
  5. Step 5: Solve for x
    x = 119,767.43/388.75
  6. Step 6: Final answer
    x = 308.08

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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.