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Finding the Fourth Proportional to 105.60, 158.39 and 47.81

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Solution

The fourth proportional to 105.60, 158.39 and 47.81 is: 71.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.60 : 158.39 = 47.81 : x
  2. Step 2: Convert to fraction form
    105.60/158.39 = 47.81/x
  3. Step 3: Cross multiply
    105.60x = 158.39 × 47.81
  4. Step 4: Simplify right side
    105.60x = 7,571.83
  5. Step 5: Solve for x
    x = 7,571.83/105.60
  6. Step 6: Final answer
    x = 71.71

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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.