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Finding the Fourth Proportional to 391.94, 588.12 and 186.38

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Solution

The fourth proportional to 391.94, 588.12 and 186.38 is: 279.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.94 : 588.12 = 186.38 : x
  2. Step 2: Convert to fraction form
    391.94/588.12 = 186.38/x
  3. Step 3: Cross multiply
    391.94x = 588.12 × 186.38
  4. Step 4: Simplify right side
    391.94x = 109,613.81
  5. Step 5: Solve for x
    x = 109,613.81/391.94
  6. Step 6: Final answer
    x = 279.67

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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.