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Finding the Fourth Proportional to 619.72, 855.28 and 395.86

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Solution

The fourth proportional to 619.72, 855.28 and 395.86 is: 546.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.72 : 855.28 = 395.86 : x
  2. Step 2: Convert to fraction form
    619.72/855.28 = 395.86/x
  3. Step 3: Cross multiply
    619.72x = 855.28 × 395.86
  4. Step 4: Simplify right side
    619.72x = 338,568.81
  5. Step 5: Solve for x
    x = 338,568.81/619.72
  6. Step 6: Final answer
    x = 546.33

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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.