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Finding the Fourth Proportional to 275.76, 413.40 and 138.69

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Solution

The fourth proportional to 275.76, 413.40 and 138.69 is: 207.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.76 : 413.40 = 138.69 : x
  2. Step 2: Convert to fraction form
    275.76/413.40 = 138.69/x
  3. Step 3: Cross multiply
    275.76x = 413.40 × 138.69
  4. Step 4: Simplify right side
    275.76x = 57,334.45
  5. Step 5: Solve for x
    x = 57,334.45/275.76
  6. Step 6: Final answer
    x = 207.91

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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.