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Finding the Fourth Proportional to 105.13, 144.79 and 99.19

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Solution

The fourth proportional to 105.13, 144.79 and 99.19 is: 136.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.13 : 144.79 = 99.19 : x
  2. Step 2: Convert to fraction form
    105.13/144.79 = 99.19/x
  3. Step 3: Cross multiply
    105.13x = 144.79 × 99.19
  4. Step 4: Simplify right side
    105.13x = 14,361.72
  5. Step 5: Solve for x
    x = 14,361.72/105.13
  6. Step 6: Final answer
    x = 136.61

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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.