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Finding the Fourth Proportional to 392.45, 588.26 and 218.90

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Solution

The fourth proportional to 392.45, 588.26 and 218.90 is: 328.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.45 : 588.26 = 218.90 : x
  2. Step 2: Convert to fraction form
    392.45/588.26 = 218.90/x
  3. Step 3: Cross multiply
    392.45x = 588.26 × 218.90
  4. Step 4: Simplify right side
    392.45x = 128,772.13
  5. Step 5: Solve for x
    x = 128,772.13/392.45
  6. Step 6: Final answer
    x = 328.13

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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.