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Finding the Fourth Proportional to 121.91, 181.71 and 114.08

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Solution

The fourth proportional to 121.91, 181.71 and 114.08 is: 170.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.91 : 181.71 = 114.08 : x
  2. Step 2: Convert to fraction form
    121.91/181.71 = 114.08/x
  3. Step 3: Cross multiply
    121.91x = 181.71 × 114.08
  4. Step 4: Simplify right side
    121.91x = 20,728.57
  5. Step 5: Solve for x
    x = 20,728.57/121.91
  6. Step 6: Final answer
    x = 170.04

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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.