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Finding the Fourth Proportional to 619.75, 855.38 and 383.74

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Solution

The fourth proportional to 619.75, 855.38 and 383.74 is: 529.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.75 : 855.38 = 383.74 : x
  2. Step 2: Convert to fraction form
    619.75/855.38 = 383.74/x
  3. Step 3: Cross multiply
    619.75x = 855.38 × 383.74
  4. Step 4: Simplify right side
    619.75x = 328,243.52
  5. Step 5: Solve for x
    x = 328,243.52/619.75
  6. Step 6: Final answer
    x = 529.64

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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.