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Finding the Fourth Proportional to 391.66, 588.11 and 311.18

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Solution

The fourth proportional to 391.66, 588.11 and 311.18 is: 467.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.66 : 588.11 = 311.18 : x
  2. Step 2: Convert to fraction form
    391.66/588.11 = 311.18/x
  3. Step 3: Cross multiply
    391.66x = 588.11 × 311.18
  4. Step 4: Simplify right side
    391.66x = 183,003.57
  5. Step 5: Solve for x
    x = 183,003.57/391.66
  6. Step 6: Final answer
    x = 467.25

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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.