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Finding the Fourth Proportional to 391.80, 587.25 and 148.22

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Solution

The fourth proportional to 391.80, 587.25 and 148.22 is: 222.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.80 : 587.25 = 148.22 : x
  2. Step 2: Convert to fraction form
    391.80/587.25 = 148.22/x
  3. Step 3: Cross multiply
    391.80x = 587.25 × 148.22
  4. Step 4: Simplify right side
    391.80x = 87,042.20
  5. Step 5: Solve for x
    x = 87,042.20/391.80
  6. Step 6: Final answer
    x = 222.16

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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.