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Finding the Fourth Proportional to 275.85, 413.46 and 138.78

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Solution

The fourth proportional to 275.85, 413.46 and 138.78 is: 208.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.85 : 413.46 = 138.78 : x
  2. Step 2: Convert to fraction form
    275.85/413.46 = 138.78/x
  3. Step 3: Cross multiply
    275.85x = 413.46 × 138.78
  4. Step 4: Simplify right side
    275.85x = 57,379.98
  5. Step 5: Solve for x
    x = 57,379.98/275.85
  6. Step 6: Final answer
    x = 208.01

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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.