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Finding the Fourth Proportional to 559.34, 771.87 and 310.66

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Solution

The fourth proportional to 559.34, 771.87 and 310.66 is: 428.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.34 : 771.87 = 310.66 : x
  2. Step 2: Convert to fraction form
    559.34/771.87 = 310.66/x
  3. Step 3: Cross multiply
    559.34x = 771.87 × 310.66
  4. Step 4: Simplify right side
    559.34x = 239,789.13
  5. Step 5: Solve for x
    x = 239,789.13/559.34
  6. Step 6: Final answer
    x = 428.70

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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.