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Finding the Fourth Proportional to 619.88, 855.48 and 399.35

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Solution

The fourth proportional to 619.88, 855.48 and 399.35 is: 551.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.88 : 855.48 = 399.35 : x
  2. Step 2: Convert to fraction form
    619.88/855.48 = 399.35/x
  3. Step 3: Cross multiply
    619.88x = 855.48 × 399.35
  4. Step 4: Simplify right side
    619.88x = 341,631.66
  5. Step 5: Solve for x
    x = 341,631.66/619.88
  6. Step 6: Final answer
    x = 551.13

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.