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Finding the Fourth Proportional to 105.79, 158.68 and 40.81

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Solution

The fourth proportional to 105.79, 158.68 and 40.81 is: 61.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.79 : 158.68 = 40.81 : x
  2. Step 2: Convert to fraction form
    105.79/158.68 = 40.81/x
  3. Step 3: Cross multiply
    105.79x = 158.68 × 40.81
  4. Step 4: Simplify right side
    105.79x = 6,475.39
  5. Step 5: Solve for x
    x = 6,475.39/105.79
  6. Step 6: Final answer
    x = 61.21

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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.