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Finding the Fourth Proportional to 391.74, 587.66 and 117.84

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Solution

The fourth proportional to 391.74, 587.66 and 117.84 is: 176.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.74 : 587.66 = 117.84 : x
  2. Step 2: Convert to fraction form
    391.74/587.66 = 117.84/x
  3. Step 3: Cross multiply
    391.74x = 587.66 × 117.84
  4. Step 4: Simplify right side
    391.74x = 69,249.85
  5. Step 5: Solve for x
    x = 69,249.85/391.74
  6. Step 6: Final answer
    x = 176.78

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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.