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Finding the Fourth Proportional to 559.11, 771.60 and 310.43

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Solution

The fourth proportional to 559.11, 771.60 and 310.43 is: 428.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.11 : 771.60 = 310.43 : x
  2. Step 2: Convert to fraction form
    559.11/771.60 = 310.43/x
  3. Step 3: Cross multiply
    559.11x = 771.60 × 310.43
  4. Step 4: Simplify right side
    559.11x = 239,526.24
  5. Step 5: Solve for x
    x = 239,526.24/559.11
  6. Step 6: Final answer
    x = 428.41

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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.