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Finding the Fourth Proportional to 299.72, 413.59 and 221.08

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Solution

The fourth proportional to 299.72, 413.59 and 221.08 is: 305.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.72 : 413.59 = 221.08 : x
  2. Step 2: Convert to fraction form
    299.72/413.59 = 221.08/x
  3. Step 3: Cross multiply
    299.72x = 413.59 × 221.08
  4. Step 4: Simplify right side
    299.72x = 91,434.85
  5. Step 5: Solve for x
    x = 91,434.85/299.72
  6. Step 6: Final answer
    x = 305.07

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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.