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Finding the Fourth Proportional to 70.44, 105.81 and 54.51

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Solution

The fourth proportional to 70.44, 105.81 and 54.51 is: 81.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.44 : 105.81 = 54.51 : x
  2. Step 2: Convert to fraction form
    70.44/105.81 = 54.51/x
  3. Step 3: Cross multiply
    70.44x = 105.81 × 54.51
  4. Step 4: Simplify right side
    70.44x = 5,767.70
  5. Step 5: Solve for x
    x = 5,767.70/70.44
  6. Step 6: Final answer
    x = 81.88

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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.