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Finding the Fourth Proportional to 619.97, 855.59 and 371.30

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Solution

The fourth proportional to 619.97, 855.59 and 371.30 is: 512.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.97 : 855.59 = 371.30 : x
  2. Step 2: Convert to fraction form
    619.97/855.59 = 371.30/x
  3. Step 3: Cross multiply
    619.97x = 855.59 × 371.30
  4. Step 4: Simplify right side
    619.97x = 317,674.43
  5. Step 5: Solve for x
    x = 317,674.43/619.97
  6. Step 6: Final answer
    x = 512.41

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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.