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Finding the Fourth Proportional to 121.24, 181.91 and 106.05

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Solution

The fourth proportional to 121.24, 181.91 and 106.05 is: 159.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.24 : 181.91 = 106.05 : x
  2. Step 2: Convert to fraction form
    121.24/181.91 = 106.05/x
  3. Step 3: Cross multiply
    121.24x = 181.91 × 106.05
  4. Step 4: Simplify right side
    121.24x = 19,291.56
  5. Step 5: Solve for x
    x = 19,291.56/121.24
  6. Step 6: Final answer
    x = 159.12

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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.