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Finding the Fourth Proportional to 121.87, 181.85 and 107.29

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Solution

The fourth proportional to 121.87, 181.85 and 107.29 is: 160.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.87 : 181.85 = 107.29 : x
  2. Step 2: Convert to fraction form
    121.87/181.85 = 107.29/x
  3. Step 3: Cross multiply
    121.87x = 181.85 × 107.29
  4. Step 4: Simplify right side
    121.87x = 19,510.69
  5. Step 5: Solve for x
    x = 19,510.69/121.87
  6. Step 6: Final answer
    x = 160.09

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.