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Finding the Fourth Proportional to 275.81, 413.90 and 121.78

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Solution

The fourth proportional to 275.81, 413.90 and 121.78 is: 182.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.81 : 413.90 = 121.78 : x
  2. Step 2: Convert to fraction form
    275.81/413.90 = 121.78/x
  3. Step 3: Cross multiply
    275.81x = 413.90 × 121.78
  4. Step 4: Simplify right side
    275.81x = 50,403.10
  5. Step 5: Solve for x
    x = 50,403.10/275.81
  6. Step 6: Final answer
    x = 182.75

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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.