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Finding the Fourth Proportional to 70.27, 105.39 and 43.21

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Solution

The fourth proportional to 70.27, 105.39 and 43.21 is: 64.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.27 : 105.39 = 43.21 : x
  2. Step 2: Convert to fraction form
    70.27/105.39 = 43.21/x
  3. Step 3: Cross multiply
    70.27x = 105.39 × 43.21
  4. Step 4: Simplify right side
    70.27x = 4,553.90
  5. Step 5: Solve for x
    x = 4,553.90/70.27
  6. Step 6: Final answer
    x = 64.81

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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.