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Finding the Fourth Proportional to 559.41, 771.89 and 310.72

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Solution

The fourth proportional to 559.41, 771.89 and 310.72 is: 428.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.41 : 771.89 = 310.72 : x
  2. Step 2: Convert to fraction form
    559.41/771.89 = 310.72/x
  3. Step 3: Cross multiply
    559.41x = 771.89 × 310.72
  4. Step 4: Simplify right side
    559.41x = 239,841.66
  5. Step 5: Solve for x
    x = 239,841.66/559.41
  6. Step 6: Final answer
    x = 428.74

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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.