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Finding the Fourth Proportional to 559.19, 771.69 and 310.50

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Solution

The fourth proportional to 559.19, 771.69 and 310.50 is: 428.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.19 : 771.69 = 310.50 : x
  2. Step 2: Convert to fraction form
    559.19/771.69 = 310.50/x
  3. Step 3: Cross multiply
    559.19x = 771.69 × 310.50
  4. Step 4: Simplify right side
    559.19x = 239,609.75
  5. Step 5: Solve for x
    x = 239,609.75/559.19
  6. Step 6: Final answer
    x = 428.50

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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.