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Finding the Fourth Proportional to 121.01, 181.52 and 86.69

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Solution

The fourth proportional to 121.01, 181.52 and 86.69 is: 130.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.01 : 181.52 = 86.69 : x
  2. Step 2: Convert to fraction form
    121.01/181.52 = 86.69/x
  3. Step 3: Cross multiply
    121.01x = 181.52 × 86.69
  4. Step 4: Simplify right side
    121.01x = 15,735.78
  5. Step 5: Solve for x
    x = 15,735.78/121.01
  6. Step 6: Final answer
    x = 130.04

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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.