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Finding the Fourth Proportional to 298.08, 411.48 and 209.79

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Solution

The fourth proportional to 298.08, 411.48 and 209.79 is: 289.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.08 : 411.48 = 209.79 : x
  2. Step 2: Convert to fraction form
    298.08/411.48 = 209.79/x
  3. Step 3: Cross multiply
    298.08x = 411.48 × 209.79
  4. Step 4: Simplify right side
    298.08x = 86,324.39
  5. Step 5: Solve for x
    x = 86,324.39/298.08
  6. Step 6: Final answer
    x = 289.60

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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.