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Finding the Fourth Proportional to 619.87, 855.60 and 383.89

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Solution

The fourth proportional to 619.87, 855.60 and 383.89 is: 529.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.87 : 855.60 = 383.89 : x
  2. Step 2: Convert to fraction form
    619.87/855.60 = 383.89/x
  3. Step 3: Cross multiply
    619.87x = 855.60 × 383.89
  4. Step 4: Simplify right side
    619.87x = 328,450.09
  5. Step 5: Solve for x
    x = 328,450.09/619.87
  6. Step 6: Final answer
    x = 529.87

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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.