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Finding the Fourth Proportional to 298.30, 447.45 and 135.79

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Solution

The fourth proportional to 298.30, 447.45 and 135.79 is: 203.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.30 : 447.45 = 135.79 : x
  2. Step 2: Convert to fraction form
    298.30/447.45 = 135.79/x
  3. Step 3: Cross multiply
    298.30x = 447.45 × 135.79
  4. Step 4: Simplify right side
    298.30x = 60,759.29
  5. Step 5: Solve for x
    x = 60,759.29/298.30
  6. Step 6: Final answer
    x = 203.69

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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.