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Finding the Fourth Proportional to 619.40, 855.61 and 495.95

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Solution

The fourth proportional to 619.40, 855.61 and 495.95 is: 685.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.40 : 855.61 = 495.95 : x
  2. Step 2: Convert to fraction form
    619.40/855.61 = 495.95/x
  3. Step 3: Cross multiply
    619.40x = 855.61 × 495.95
  4. Step 4: Simplify right side
    619.40x = 424,334.26
  5. Step 5: Solve for x
    x = 424,334.26/619.40
  6. Step 6: Final answer
    x = 685.07

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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.