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Finding the Fourth Proportional to 298.50, 412.11 and 220.74

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Solution

The fourth proportional to 298.50, 412.11 and 220.74 is: 304.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.50 : 412.11 = 220.74 : x
  2. Step 2: Convert to fraction form
    298.50/412.11 = 220.74/x
  3. Step 3: Cross multiply
    298.50x = 412.11 × 220.74
  4. Step 4: Simplify right side
    298.50x = 90,969.16
  5. Step 5: Solve for x
    x = 90,969.16/298.50
  6. Step 6: Final answer
    x = 304.75

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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.