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Finding the Fourth Proportional to 107.89, 149.12 and 83.32

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Solution

The fourth proportional to 107.89, 149.12 and 83.32 is: 115.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.89 : 149.12 = 83.32 : x
  2. Step 2: Convert to fraction form
    107.89/149.12 = 83.32/x
  3. Step 3: Cross multiply
    107.89x = 149.12 × 83.32
  4. Step 4: Simplify right side
    107.89x = 12,424.68
  5. Step 5: Solve for x
    x = 12,424.68/107.89
  6. Step 6: Final answer
    x = 115.16

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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.