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Finding the Fourth Proportional to 391.25, 586.58 and 131.16

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Solution

The fourth proportional to 391.25, 586.58 and 131.16 is: 196.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.25 : 586.58 = 131.16 : x
  2. Step 2: Convert to fraction form
    391.25/586.58 = 131.16/x
  3. Step 3: Cross multiply
    391.25x = 586.58 × 131.16
  4. Step 4: Simplify right side
    391.25x = 76,935.83
  5. Step 5: Solve for x
    x = 76,935.83/391.25
  6. Step 6: Final answer
    x = 196.64

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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.