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Finding the Fourth Proportional to 121.83, 181.27 and 121.42

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Solution

The fourth proportional to 121.83, 181.27 and 121.42 is: 180.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.83 : 181.27 = 121.42 : x
  2. Step 2: Convert to fraction form
    121.83/181.27 = 121.42/x
  3. Step 3: Cross multiply
    121.83x = 181.27 × 121.42
  4. Step 4: Simplify right side
    121.83x = 22,009.80
  5. Step 5: Solve for x
    x = 22,009.80/121.83
  6. Step 6: Final answer
    x = 180.66

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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.