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Finding the Fourth Proportional to 619.95, 855.18 and 357.92

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Solution

The fourth proportional to 619.95, 855.18 and 357.92 is: 493.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.95 : 855.18 = 357.92 : x
  2. Step 2: Convert to fraction form
    619.95/855.18 = 357.92/x
  3. Step 3: Cross multiply
    619.95x = 855.18 × 357.92
  4. Step 4: Simplify right side
    619.95x = 306,081.75
  5. Step 5: Solve for x
    x = 306,081.75/619.95
  6. Step 6: Final answer
    x = 493.72

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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.