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Finding the Fourth Proportional to 391.09, 586.64 and 131.07

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Solution

The fourth proportional to 391.09, 586.64 and 131.07 is: 196.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.09 : 586.64 = 131.07 : x
  2. Step 2: Convert to fraction form
    391.09/586.64 = 131.07/x
  3. Step 3: Cross multiply
    391.09x = 586.64 × 131.07
  4. Step 4: Simplify right side
    391.09x = 76,890.25
  5. Step 5: Solve for x
    x = 76,890.25/391.09
  6. Step 6: Final answer
    x = 196.61

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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.