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Finding the Fourth Proportional to 619.86, 855.33 and 357.87

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Solution

The fourth proportional to 619.86, 855.33 and 357.87 is: 493.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.86 : 855.33 = 357.87 : x
  2. Step 2: Convert to fraction form
    619.86/855.33 = 357.87/x
  3. Step 3: Cross multiply
    619.86x = 855.33 × 357.87
  4. Step 4: Simplify right side
    619.86x = 306,096.95
  5. Step 5: Solve for x
    x = 306,096.95/619.86
  6. Step 6: Final answer
    x = 493.82

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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.