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Finding the Fourth Proportional to 275.51, 413.20 and 80.51

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Solution

The fourth proportional to 275.51, 413.20 and 80.51 is: 120.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.51 : 413.20 = 80.51 : x
  2. Step 2: Convert to fraction form
    275.51/413.20 = 80.51/x
  3. Step 3: Cross multiply
    275.51x = 413.20 × 80.51
  4. Step 4: Simplify right side
    275.51x = 33,266.33
  5. Step 5: Solve for x
    x = 33,266.33/275.51
  6. Step 6: Final answer
    x = 120.74

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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.