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Finding the Fourth Proportional to 1,042.49, 1,563.42 and 311.87

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Solution

The fourth proportional to 1,042.49, 1,563.42 and 311.87 is: 467.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.49 : 1,563.42 = 311.87 : x
  2. Step 2: Convert to fraction form
    1,042.49/1,563.42 = 311.87/x
  3. Step 3: Cross multiply
    1,042.49x = 1,563.42 × 311.87
  4. Step 4: Simplify right side
    1,042.49x = 487,583.80
  5. Step 5: Solve for x
    x = 487,583.80/1,042.49
  6. Step 6: Final answer
    x = 467.71

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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.