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Finding the Fourth Proportional to 619.69, 855.19 and 371.02

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Solution

The fourth proportional to 619.69, 855.19 and 371.02 is: 512.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.69 : 855.19 = 371.02 : x
  2. Step 2: Convert to fraction form
    619.69/855.19 = 371.02/x
  3. Step 3: Cross multiply
    619.69x = 855.19 × 371.02
  4. Step 4: Simplify right side
    619.69x = 317,293.80
  5. Step 5: Solve for x
    x = 317,293.80/619.69
  6. Step 6: Final answer
    x = 512.02

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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.