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Finding the Fourth Proportional to 107.93, 149.06 and 81.65

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Solution

The fourth proportional to 107.93, 149.06 and 81.65 is: 112.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.93 : 149.06 = 81.65 : x
  2. Step 2: Convert to fraction form
    107.93/149.06 = 81.65/x
  3. Step 3: Cross multiply
    107.93x = 149.06 × 81.65
  4. Step 4: Simplify right side
    107.93x = 12,171.33
  5. Step 5: Solve for x
    x = 12,171.33/107.93
  6. Step 6: Final answer
    x = 112.77

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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.