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Finding the Fourth Proportional to 107.18, 160.86 and 81.53

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Solution

The fourth proportional to 107.18, 160.86 and 81.53 is: 122.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.18 : 160.86 = 81.53 : x
  2. Step 2: Convert to fraction form
    107.18/160.86 = 81.53/x
  3. Step 3: Cross multiply
    107.18x = 160.86 × 81.53
  4. Step 4: Simplify right side
    107.18x = 13,114.92
  5. Step 5: Solve for x
    x = 13,114.92/107.18
  6. Step 6: Final answer
    x = 122.36

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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.