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Finding the Fourth Proportional to 559, 771.40 and 310.32

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Solution

The fourth proportional to 559, 771.40 and 310.32 is: 428.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    559 : 771.40 = 310.32 : x
  2. Step 2: Convert to fraction form
    559/771.40 = 310.32/x
  3. Step 3: Cross multiply
    559x = 771.40 × 310.32
  4. Step 4: Simplify right side
    559x = 239,380.85
  5. Step 5: Solve for x
    x = 239,380.85/559
  6. Step 6: Final answer
    x = 428.23

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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.