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Finding the Fourth Proportional to 104.81, 144.68 and 72.09

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Solution

The fourth proportional to 104.81, 144.68 and 72.09 is: 99.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.81 : 144.68 = 72.09 : x
  2. Step 2: Convert to fraction form
    104.81/144.68 = 72.09/x
  3. Step 3: Cross multiply
    104.81x = 144.68 × 72.09
  4. Step 4: Simplify right side
    104.81x = 10,429.62
  5. Step 5: Solve for x
    x = 10,429.62/104.81
  6. Step 6: Final answer
    x = 99.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.