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Finding the Fourth Proportional to 382.60, 573.90 and 209.20

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Solution

The fourth proportional to 382.60, 573.90 and 209.20 is: 313.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.60 : 573.90 = 209.20 : x
  2. Step 2: Convert to fraction form
    382.60/573.90 = 209.20/x
  3. Step 3: Cross multiply
    382.60x = 573.90 × 209.20
  4. Step 4: Simplify right side
    382.60x = 120,059.88
  5. Step 5: Solve for x
    x = 120,059.88/382.60
  6. Step 6: Final answer
    x = 313.80

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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.