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Finding the Fourth Proportional to 619.74, 855.81 and 495

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Solution

The fourth proportional to 619.74, 855.81 and 495 is: 683.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.74 : 855.81 = 495 : x
  2. Step 2: Convert to fraction form
    619.74/855.81 = 495/x
  3. Step 3: Cross multiply
    619.74x = 855.81 × 495
  4. Step 4: Simplify right side
    619.74x = 423,625.95
  5. Step 5: Solve for x
    x = 423,625.95/619.74
  6. Step 6: Final answer
    x = 683.55

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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.