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Finding the Fourth Proportional to 394.20, 591.28 and 105.68

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Solution

The fourth proportional to 394.20, 591.28 and 105.68 is: 158.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.20 : 591.28 = 105.68 : x
  2. Step 2: Convert to fraction form
    394.20/591.28 = 105.68/x
  3. Step 3: Cross multiply
    394.20x = 591.28 × 105.68
  4. Step 4: Simplify right side
    394.20x = 62,486.47
  5. Step 5: Solve for x
    x = 62,486.47/394.20
  6. Step 6: Final answer
    x = 158.51

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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.