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Finding the Fourth Proportional to 1,872.37, 2,809.03 and 639.60

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Solution

The fourth proportional to 1,872.37, 2,809.03 and 639.60 is: 959.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,872.37 : 2,809.03 = 639.60 : x
  2. Step 2: Convert to fraction form
    1,872.37/2,809.03 = 639.60/x
  3. Step 3: Cross multiply
    1,872.37x = 2,809.03 × 639.60
  4. Step 4: Simplify right side
    1,872.37x = 1,796,644.65
  5. Step 5: Solve for x
    x = 1,796,644.65/1,872.37
  6. Step 6: Final answer
    x = 959.56

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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.