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Finding the Fourth Proportional to 559.21, 771.70 and 310.52

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Solution

The fourth proportional to 559.21, 771.70 and 310.52 is: 428.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.21 : 771.70 = 310.52 : x
  2. Step 2: Convert to fraction form
    559.21/771.70 = 310.52/x
  3. Step 3: Cross multiply
    559.21x = 771.70 × 310.52
  4. Step 4: Simplify right side
    559.21x = 239,628.28
  5. Step 5: Solve for x
    x = 239,628.28/559.21
  6. Step 6: Final answer
    x = 428.51

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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.