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Finding the Fourth Proportional to 394.34, 591.45 and 105.80

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Solution

The fourth proportional to 394.34, 591.45 and 105.80 is: 158.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.34 : 591.45 = 105.80 : x
  2. Step 2: Convert to fraction form
    394.34/591.45 = 105.80/x
  3. Step 3: Cross multiply
    394.34x = 591.45 × 105.80
  4. Step 4: Simplify right side
    394.34x = 62,572.45
  5. Step 5: Solve for x
    x = 62,572.45/394.34
  6. Step 6: Final answer
    x = 158.68

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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.