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Finding the Fourth Proportional to 391.13, 586.69 and 198.75

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Solution

The fourth proportional to 391.13, 586.69 and 198.75 is: 298.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.13 : 586.69 = 198.75 : x
  2. Step 2: Convert to fraction form
    391.13/586.69 = 198.75/x
  3. Step 3: Cross multiply
    391.13x = 586.69 × 198.75
  4. Step 4: Simplify right side
    391.13x = 116,604.64
  5. Step 5: Solve for x
    x = 116,604.64/391.13
  6. Step 6: Final answer
    x = 298.12

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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.