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Finding the Fourth Proportional to 276.13, 413.80 and 138.98

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Solution

The fourth proportional to 276.13, 413.80 and 138.98 is: 208.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.13 : 413.80 = 138.98 : x
  2. Step 2: Convert to fraction form
    276.13/413.80 = 138.98/x
  3. Step 3: Cross multiply
    276.13x = 413.80 × 138.98
  4. Step 4: Simplify right side
    276.13x = 57,509.92
  5. Step 5: Solve for x
    x = 57,509.92/276.13
  6. Step 6: Final answer
    x = 208.27

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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.