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Finding the Fourth Proportional to 275.60, 413.28 and 138.48

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Solution

The fourth proportional to 275.60, 413.28 and 138.48 is: 207.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.60 : 413.28 = 138.48 : x
  2. Step 2: Convert to fraction form
    275.60/413.28 = 138.48/x
  3. Step 3: Cross multiply
    275.60x = 413.28 × 138.48
  4. Step 4: Simplify right side
    275.60x = 57,231.01
  5. Step 5: Solve for x
    x = 57,231.01/275.60
  6. Step 6: Final answer
    x = 207.66

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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.