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Finding the Fourth Proportional to 392.40, 588.48 and 161.28

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Solution

The fourth proportional to 392.40, 588.48 and 161.28 is: 241.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.40 : 588.48 = 161.28 : x
  2. Step 2: Convert to fraction form
    392.40/588.48 = 161.28/x
  3. Step 3: Cross multiply
    392.40x = 588.48 × 161.28
  4. Step 4: Simplify right side
    392.40x = 94,910.05
  5. Step 5: Solve for x
    x = 94,910.05/392.40
  6. Step 6: Final answer
    x = 241.87

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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.