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Finding the Fourth Proportional to 382.20, 572.26 and 266.40

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Solution

The fourth proportional to 382.20, 572.26 and 266.40 is: 398.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.20 : 572.26 = 266.40 : x
  2. Step 2: Convert to fraction form
    382.20/572.26 = 266.40/x
  3. Step 3: Cross multiply
    382.20x = 572.26 × 266.40
  4. Step 4: Simplify right side
    382.20x = 152,450.06
  5. Step 5: Solve for x
    x = 152,450.06/382.20
  6. Step 6: Final answer
    x = 398.88

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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.