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Finding the Fourth Proportional to 391.16, 586.38 and 198.56

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Solution

The fourth proportional to 391.16, 586.38 and 198.56 is: 297.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.16 : 586.38 = 198.56 : x
  2. Step 2: Convert to fraction form
    391.16/586.38 = 198.56/x
  3. Step 3: Cross multiply
    391.16x = 586.38 × 198.56
  4. Step 4: Simplify right side
    391.16x = 116,431.61
  5. Step 5: Solve for x
    x = 116,431.61/391.16
  6. Step 6: Final answer
    x = 297.66

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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.