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Finding the Fourth Proportional to 619.39, 854.90 and 357.49

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Solution

The fourth proportional to 619.39, 854.90 and 357.49 is: 493.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.39 : 854.90 = 357.49 : x
  2. Step 2: Convert to fraction form
    619.39/854.90 = 357.49/x
  3. Step 3: Cross multiply
    619.39x = 854.90 × 357.49
  4. Step 4: Simplify right side
    619.39x = 305,618.20
  5. Step 5: Solve for x
    x = 305,618.20/619.39
  6. Step 6: Final answer
    x = 493.42

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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.