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Finding the Fourth Proportional to 558.84, 771.22 and 310.20

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Solution

The fourth proportional to 558.84, 771.22 and 310.20 is: 428.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.84 : 771.22 = 310.20 : x
  2. Step 2: Convert to fraction form
    558.84/771.22 = 310.20/x
  3. Step 3: Cross multiply
    558.84x = 771.22 × 310.20
  4. Step 4: Simplify right side
    558.84x = 239,232.44
  5. Step 5: Solve for x
    x = 239,232.44/558.84
  6. Step 6: Final answer
    x = 428.09

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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.