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Finding the Fourth Proportional to 105.09, 144.99 and 65.73

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Solution

The fourth proportional to 105.09, 144.99 and 65.73 is: 90.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.09 : 144.99 = 65.73 : x
  2. Step 2: Convert to fraction form
    105.09/144.99 = 65.73/x
  3. Step 3: Cross multiply
    105.09x = 144.99 × 65.73
  4. Step 4: Simplify right side
    105.09x = 9,530.19
  5. Step 5: Solve for x
    x = 9,530.19/105.09
  6. Step 6: Final answer
    x = 90.69

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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.