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Finding the Fourth Proportional to 298.60, 447.90 and 82.20

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Solution

The fourth proportional to 298.60, 447.90 and 82.20 is: 123.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.60 : 447.90 = 82.20 : x
  2. Step 2: Convert to fraction form
    298.60/447.90 = 82.20/x
  3. Step 3: Cross multiply
    298.60x = 447.90 × 82.20
  4. Step 4: Simplify right side
    298.60x = 36,817.38
  5. Step 5: Solve for x
    x = 36,817.38/298.60
  6. Step 6: Final answer
    x = 123.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.