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Finding the Fourth Proportional to 107.12, 160.82 and 91.19

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Solution

The fourth proportional to 107.12, 160.82 and 91.19 is: 136.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.12 : 160.82 = 91.19 : x
  2. Step 2: Convert to fraction form
    107.12/160.82 = 91.19/x
  3. Step 3: Cross multiply
    107.12x = 160.82 × 91.19
  4. Step 4: Simplify right side
    107.12x = 14,665.18
  5. Step 5: Solve for x
    x = 14,665.18/107.12
  6. Step 6: Final answer
    x = 136.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.