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Finding the Fourth Proportional to 619.40, 853.97 and 486.36

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Solution

The fourth proportional to 619.40, 853.97 and 486.36 is: 670.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.40 : 853.97 = 486.36 : x
  2. Step 2: Convert to fraction form
    619.40/853.97 = 486.36/x
  3. Step 3: Cross multiply
    619.40x = 853.97 × 486.36
  4. Step 4: Simplify right side
    619.40x = 415,334.42
  5. Step 5: Solve for x
    x = 415,334.42/619.40
  6. Step 6: Final answer
    x = 670.54

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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.