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Finding the Fourth Proportional to 579.21, 799.34 and 317.22

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Solution

The fourth proportional to 579.21, 799.34 and 317.22 is: 437.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.21 : 799.34 = 317.22 : x
  2. Step 2: Convert to fraction form
    579.21/799.34 = 317.22/x
  3. Step 3: Cross multiply
    579.21x = 799.34 × 317.22
  4. Step 4: Simplify right side
    579.21x = 253,565.05
  5. Step 5: Solve for x
    x = 253,565.05/579.21
  6. Step 6: Final answer
    x = 437.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.