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Finding the Fourth Proportional to 275.78, 413.65 and 138.93

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Solution

The fourth proportional to 275.78, 413.65 and 138.93 is: 208.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.78 : 413.65 = 138.93 : x
  2. Step 2: Convert to fraction form
    275.78/413.65 = 138.93/x
  3. Step 3: Cross multiply
    275.78x = 413.65 × 138.93
  4. Step 4: Simplify right side
    275.78x = 57,468.39
  5. Step 5: Solve for x
    x = 57,468.39/275.78
  6. Step 6: Final answer
    x = 208.38

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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.