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Finding the Fourth Proportional to 391.79, 587.61 and 117.83

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Solution

The fourth proportional to 391.79, 587.61 and 117.83 is: 176.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.79 : 587.61 = 117.83 : x
  2. Step 2: Convert to fraction form
    391.79/587.61 = 117.83/x
  3. Step 3: Cross multiply
    391.79x = 587.61 × 117.83
  4. Step 4: Simplify right side
    391.79x = 69,235.15
  5. Step 5: Solve for x
    x = 69,235.15/391.79
  6. Step 6: Final answer
    x = 176.72

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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.