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Finding the Fourth Proportional to 298.70, 447.99 and 103.70

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Solution

The fourth proportional to 298.70, 447.99 and 103.70 is: 155.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.70 : 447.99 = 103.70 : x
  2. Step 2: Convert to fraction form
    298.70/447.99 = 103.70/x
  3. Step 3: Cross multiply
    298.70x = 447.99 × 103.70
  4. Step 4: Simplify right side
    298.70x = 46,456.56
  5. Step 5: Solve for x
    x = 46,456.56/298.70
  6. Step 6: Final answer
    x = 155.53

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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.