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Finding the Fourth Proportional to 391.77, 587.42 and 148.31

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Solution

The fourth proportional to 391.77, 587.42 and 148.31 is: 222.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.77 : 587.42 = 148.31 : x
  2. Step 2: Convert to fraction form
    391.77/587.42 = 148.31/x
  3. Step 3: Cross multiply
    391.77x = 587.42 × 148.31
  4. Step 4: Simplify right side
    391.77x = 87,120.63
  5. Step 5: Solve for x
    x = 87,120.63/391.77
  6. Step 6: Final answer
    x = 222.38

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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.