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Finding the Fourth Proportional to 275.12, 412.87 and 121.15

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Solution

The fourth proportional to 275.12, 412.87 and 121.15 is: 181.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.12 : 412.87 = 121.15 : x
  2. Step 2: Convert to fraction form
    275.12/412.87 = 121.15/x
  3. Step 3: Cross multiply
    275.12x = 412.87 × 121.15
  4. Step 4: Simplify right side
    275.12x = 50,019.20
  5. Step 5: Solve for x
    x = 50,019.20/275.12
  6. Step 6: Final answer
    x = 181.81

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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.