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Finding the Fourth Proportional to 391.85, 587.86 and 117.97

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Solution

The fourth proportional to 391.85, 587.86 and 117.97 is: 176.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.85 : 587.86 = 117.97 : x
  2. Step 2: Convert to fraction form
    391.85/587.86 = 117.97/x
  3. Step 3: Cross multiply
    391.85x = 587.86 × 117.97
  4. Step 4: Simplify right side
    391.85x = 69,348.08
  5. Step 5: Solve for x
    x = 69,348.08/391.85
  6. Step 6: Final answer
    x = 176.97

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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.