Home / 1,042.31-1,563.23-311.79

Finding the Fourth Proportional to 1,042.31, 1,563.23 and 311.79

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Solution

The fourth proportional to 1,042.31, 1,563.23 and 311.79 is: 467.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.31 : 1,563.23 = 311.79 : x
  2. Step 2: Convert to fraction form
    1,042.31/1,563.23 = 311.79/x
  3. Step 3: Cross multiply
    1,042.31x = 1,563.23 × 311.79
  4. Step 4: Simplify right side
    1,042.31x = 487,399.48
  5. Step 5: Solve for x
    x = 487,399.48/1,042.31
  6. Step 6: Final answer
    x = 467.61

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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.