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Finding the Fourth Proportional to 579.45, 869.48 and 255.05

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Solution

The fourth proportional to 579.45, 869.48 and 255.05 is: 382.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.45 : 869.48 = 255.05 : x
  2. Step 2: Convert to fraction form
    579.45/869.48 = 255.05/x
  3. Step 3: Cross multiply
    579.45x = 869.48 × 255.05
  4. Step 4: Simplify right side
    579.45x = 221,755.25
  5. Step 5: Solve for x
    x = 221,755.25/579.45
  6. Step 6: Final answer
    x = 382.70

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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.