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Finding the Fourth Proportional to 619.49, 855.47 and 494.75

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Solution

The fourth proportional to 619.49, 855.47 and 494.75 is: 683.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.49 : 855.47 = 494.75 : x
  2. Step 2: Convert to fraction form
    619.49/855.47 = 494.75/x
  3. Step 3: Cross multiply
    619.49x = 855.47 × 494.75
  4. Step 4: Simplify right side
    619.49x = 423,237.03
  5. Step 5: Solve for x
    x = 423,237.03/619.49
  6. Step 6: Final answer
    x = 683.21

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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.