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Finding the Fourth Proportional to 109.45, 164.24 and 68.91

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Solution

The fourth proportional to 109.45, 164.24 and 68.91 is: 103.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.45 : 164.24 = 68.91 : x
  2. Step 2: Convert to fraction form
    109.45/164.24 = 68.91/x
  3. Step 3: Cross multiply
    109.45x = 164.24 × 68.91
  4. Step 4: Simplify right side
    109.45x = 11,317.78
  5. Step 5: Solve for x
    x = 11,317.78/109.45
  6. Step 6: Final answer
    x = 103.41

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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.