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Finding the Fourth Proportional to 275.90, 413.90 and 138.96

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Solution

The fourth proportional to 275.90, 413.90 and 138.96 is: 208.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.90 : 413.90 = 138.96 : x
  2. Step 2: Convert to fraction form
    275.90/413.90 = 138.96/x
  3. Step 3: Cross multiply
    275.90x = 413.90 × 138.96
  4. Step 4: Simplify right side
    275.90x = 57,515.54
  5. Step 5: Solve for x
    x = 57,515.54/275.90
  6. Step 6: Final answer
    x = 208.47

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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.