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Finding the Fourth Proportional to 619.25, 855.02 and 409.35

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Solution

The fourth proportional to 619.25, 855.02 and 409.35 is: 565.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.25 : 855.02 = 409.35 : x
  2. Step 2: Convert to fraction form
    619.25/855.02 = 409.35/x
  3. Step 3: Cross multiply
    619.25x = 855.02 × 409.35
  4. Step 4: Simplify right side
    619.25x = 350,006.67
  5. Step 5: Solve for x
    x = 350,006.67/619.25
  6. Step 6: Final answer
    x = 565.22

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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.