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Finding the Fourth Proportional to 619.91, 855.39 and 371.18

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Solution

The fourth proportional to 619.91, 855.39 and 371.18 is: 512.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.91 : 855.39 = 371.18 : x
  2. Step 2: Convert to fraction form
    619.91/855.39 = 371.18/x
  3. Step 3: Cross multiply
    619.91x = 855.39 × 371.18
  4. Step 4: Simplify right side
    619.91x = 317,503.66
  5. Step 5: Solve for x
    x = 317,503.66/619.91
  6. Step 6: Final answer
    x = 512.18

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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.