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Finding the Fourth Proportional to 298.20, 411.38 and 187.64

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Solution

The fourth proportional to 298.20, 411.38 and 187.64 is: 258.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.20 : 411.38 = 187.64 : x
  2. Step 2: Convert to fraction form
    298.20/411.38 = 187.64/x
  3. Step 3: Cross multiply
    298.20x = 411.38 × 187.64
  4. Step 4: Simplify right side
    298.20x = 77,191.34
  5. Step 5: Solve for x
    x = 77,191.34/298.20
  6. Step 6: Final answer
    x = 258.86

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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.