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Finding the Fourth Proportional to 579.38, 869.21 and 271.05

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Solution

The fourth proportional to 579.38, 869.21 and 271.05 is: 406.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.38 : 869.21 = 271.05 : x
  2. Step 2: Convert to fraction form
    579.38/869.21 = 271.05/x
  3. Step 3: Cross multiply
    579.38x = 869.21 × 271.05
  4. Step 4: Simplify right side
    579.38x = 235,598.02
  5. Step 5: Solve for x
    x = 235,598.02/579.38
  6. Step 6: Final answer
    x = 406.64

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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.