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Finding the Fourth Proportional to 392.75, 588.78 and 187.22

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Solution

The fourth proportional to 392.75, 588.78 and 187.22 is: 280.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.75 : 588.78 = 187.22 : x
  2. Step 2: Convert to fraction form
    392.75/588.78 = 187.22/x
  3. Step 3: Cross multiply
    392.75x = 588.78 × 187.22
  4. Step 4: Simplify right side
    392.75x = 110,228.45
  5. Step 5: Solve for x
    x = 110,228.45/392.75
  6. Step 6: Final answer
    x = 280.66

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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.