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Finding the Fourth Proportional to 300.12, 413.78 and 261.15

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Solution

The fourth proportional to 300.12, 413.78 and 261.15 is: 360.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.12 : 413.78 = 261.15 : x
  2. Step 2: Convert to fraction form
    300.12/413.78 = 261.15/x
  3. Step 3: Cross multiply
    300.12x = 413.78 × 261.15
  4. Step 4: Simplify right side
    300.12x = 108,057.34
  5. Step 5: Solve for x
    x = 108,057.34/300.12
  6. Step 6: Final answer
    x = 360.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.