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Finding the Fourth Proportional to 275.61, 413.45 and 138.68

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Solution

The fourth proportional to 275.61, 413.45 and 138.68 is: 208.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.61 : 413.45 = 138.68 : x
  2. Step 2: Convert to fraction form
    275.61/413.45 = 138.68/x
  3. Step 3: Cross multiply
    275.61x = 413.45 × 138.68
  4. Step 4: Simplify right side
    275.61x = 57,334.49
  5. Step 5: Solve for x
    x = 57,334.49/275.61
  6. Step 6: Final answer
    x = 208.03

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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.