Home / 1,285.21-1,927.82-311.31

Finding the Fourth Proportional to 1,285.21, 1,927.82 and 311.31

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Solution

The fourth proportional to 1,285.21, 1,927.82 and 311.31 is: 466.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.21 : 1,927.82 = 311.31 : x
  2. Step 2: Convert to fraction form
    1,285.21/1,927.82 = 311.31/x
  3. Step 3: Cross multiply
    1,285.21x = 1,927.82 × 311.31
  4. Step 4: Simplify right side
    1,285.21x = 600,149.64
  5. Step 5: Solve for x
    x = 600,149.64/1,285.21
  6. Step 6: Final answer
    x = 466.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.