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Finding the Fourth Proportional to 298.10, 411 and 220.34

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Solution

The fourth proportional to 298.10, 411 and 220.34 is: 303.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.10 : 411 = 220.34 : x
  2. Step 2: Convert to fraction form
    298.10/411 = 220.34/x
  3. Step 3: Cross multiply
    298.10x = 411 × 220.34
  4. Step 4: Simplify right side
    298.10x = 90,559.74
  5. Step 5: Solve for x
    x = 90,559.74/298.10
  6. Step 6: Final answer
    x = 303.79

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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.