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Finding the Fourth Proportional to 392.18, 588.18 and 209.48

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Solution

The fourth proportional to 392.18, 588.18 and 209.48 is: 314.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.18 : 588.18 = 209.48 : x
  2. Step 2: Convert to fraction form
    392.18/588.18 = 209.48/x
  3. Step 3: Cross multiply
    392.18x = 588.18 × 209.48
  4. Step 4: Simplify right side
    392.18x = 123,211.95
  5. Step 5: Solve for x
    x = 123,211.95/392.18
  6. Step 6: Final answer
    x = 314.17

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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.