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Finding the Fourth Proportional to 391.50, 587.22 and 254.16

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Solution

The fourth proportional to 391.50, 587.22 and 254.16 is: 381.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.50 : 587.22 = 254.16 : x
  2. Step 2: Convert to fraction form
    391.50/587.22 = 254.16/x
  3. Step 3: Cross multiply
    391.50x = 587.22 × 254.16
  4. Step 4: Simplify right side
    391.50x = 149,247.84
  5. Step 5: Solve for x
    x = 149,247.84/391.50
  6. Step 6: Final answer
    x = 381.22

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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.