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Finding the Fourth Proportional to 105.18, 144.93 and 99.69

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Solution

The fourth proportional to 105.18, 144.93 and 99.69 is: 137.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.18 : 144.93 = 99.69 : x
  2. Step 2: Convert to fraction form
    105.18/144.93 = 99.69/x
  3. Step 3: Cross multiply
    105.18x = 144.93 × 99.69
  4. Step 4: Simplify right side
    105.18x = 14,448.07
  5. Step 5: Solve for x
    x = 14,448.07/105.18
  6. Step 6: Final answer
    x = 137.37

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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.