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Finding the Fourth Proportional to 298.38, 411.68 and 172.34

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Solution

The fourth proportional to 298.38, 411.68 and 172.34 is: 237.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.38 : 411.68 = 172.34 : x
  2. Step 2: Convert to fraction form
    298.38/411.68 = 172.34/x
  3. Step 3: Cross multiply
    298.38x = 411.68 × 172.34
  4. Step 4: Simplify right side
    298.38x = 70,948.85
  5. Step 5: Solve for x
    x = 70,948.85/298.38
  6. Step 6: Final answer
    x = 237.78

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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.