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Finding the Fourth Proportional to 391.86, 587.79 and 148.33

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Solution

The fourth proportional to 391.86, 587.79 and 148.33 is: 222.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.86 : 587.79 = 148.33 : x
  2. Step 2: Convert to fraction form
    391.86/587.79 = 148.33/x
  3. Step 3: Cross multiply
    391.86x = 587.79 × 148.33
  4. Step 4: Simplify right side
    391.86x = 87,185.42
  5. Step 5: Solve for x
    x = 87,185.42/391.86
  6. Step 6: Final answer
    x = 222.49

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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.