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Finding the Fourth Proportional to 559.35, 771.90 and 310.69

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Solution

The fourth proportional to 559.35, 771.90 and 310.69 is: 428.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.35 : 771.90 = 310.69 : x
  2. Step 2: Convert to fraction form
    559.35/771.90 = 310.69/x
  3. Step 3: Cross multiply
    559.35x = 771.90 × 310.69
  4. Step 4: Simplify right side
    559.35x = 239,826.20
  5. Step 5: Solve for x
    x = 239,826.20/559.35
  6. Step 6: Final answer
    x = 428.76

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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.