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Finding the Fourth Proportional to 107.22, 161.49 and 102.72

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Solution

The fourth proportional to 107.22, 161.49 and 102.72 is: 154.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.22 : 161.49 = 102.72 : x
  2. Step 2: Convert to fraction form
    107.22/161.49 = 102.72/x
  3. Step 3: Cross multiply
    107.22x = 161.49 × 102.72
  4. Step 4: Simplify right side
    107.22x = 16,588.25
  5. Step 5: Solve for x
    x = 16,588.25/107.22
  6. Step 6: Final answer
    x = 154.71

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.