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Finding the Fourth Proportional to 275.43, 413.10 and 80.39

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Solution

The fourth proportional to 275.43, 413.10 and 80.39 is: 120.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.43 : 413.10 = 80.39 : x
  2. Step 2: Convert to fraction form
    275.43/413.10 = 80.39/x
  3. Step 3: Cross multiply
    275.43x = 413.10 × 80.39
  4. Step 4: Simplify right side
    275.43x = 33,210.14
  5. Step 5: Solve for x
    x = 33,210.14/275.43
  6. Step 6: Final answer
    x = 120.57

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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.