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Finding the Fourth Proportional to 306.20, 421.26 and 300.53

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Solution

The fourth proportional to 306.20, 421.26 and 300.53 is: 413.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.20 : 421.26 = 300.53 : x
  2. Step 2: Convert to fraction form
    306.20/421.26 = 300.53/x
  3. Step 3: Cross multiply
    306.20x = 421.26 × 300.53
  4. Step 4: Simplify right side
    306.20x = 126,601.27
  5. Step 5: Solve for x
    x = 126,601.27/306.20
  6. Step 6: Final answer
    x = 413.46

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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.