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Finding the Fourth Proportional to 391.81, 587.72 and 103.25

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Solution

The fourth proportional to 391.81, 587.72 and 103.25 is: 154.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.81 : 587.72 = 103.25 : x
  2. Step 2: Convert to fraction form
    391.81/587.72 = 103.25/x
  3. Step 3: Cross multiply
    391.81x = 587.72 × 103.25
  4. Step 4: Simplify right side
    391.81x = 60,682.09
  5. Step 5: Solve for x
    x = 60,682.09/391.81
  6. Step 6: Final answer
    x = 154.88

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.