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Finding the Fourth Proportional to 275.15, 412.80 and 121.11

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Solution

The fourth proportional to 275.15, 412.80 and 121.11 is: 181.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.15 : 412.80 = 121.11 : x
  2. Step 2: Convert to fraction form
    275.15/412.80 = 121.11/x
  3. Step 3: Cross multiply
    275.15x = 412.80 × 121.11
  4. Step 4: Simplify right side
    275.15x = 49,993.75
  5. Step 5: Solve for x
    x = 49,993.75/275.15
  6. Step 6: Final answer
    x = 181.70

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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.