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Finding the Fourth Proportional to 619.73, 855.32 and 371.20

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Solution

The fourth proportional to 619.73, 855.32 and 371.20 is: 512.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.73 : 855.32 = 371.20 : x
  2. Step 2: Convert to fraction form
    619.73/855.32 = 371.20/x
  3. Step 3: Cross multiply
    619.73x = 855.32 × 371.20
  4. Step 4: Simplify right side
    619.73x = 317,488.65
  5. Step 5: Solve for x
    x = 317,488.65/619.73
  6. Step 6: Final answer
    x = 512.30

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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.