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Finding the Fourth Proportional to 619.77, 855.12 and 357.72

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Solution

The fourth proportional to 619.77, 855.12 and 357.72 is: 493.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.77 : 855.12 = 357.72 : x
  2. Step 2: Convert to fraction form
    619.77/855.12 = 357.72/x
  3. Step 3: Cross multiply
    619.77x = 855.12 × 357.72
  4. Step 4: Simplify right side
    619.77x = 305,893.53
  5. Step 5: Solve for x
    x = 305,893.53/619.77
  6. Step 6: Final answer
    x = 493.56

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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.