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Finding the Fourth Proportional to 619.43, 853.79 and 514.31

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Solution

The fourth proportional to 619.43, 853.79 and 514.31 is: 708.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.43 : 853.79 = 514.31 : x
  2. Step 2: Convert to fraction form
    619.43/853.79 = 514.31/x
  3. Step 3: Cross multiply
    619.43x = 853.79 × 514.31
  4. Step 4: Simplify right side
    619.43x = 439,105.89
  5. Step 5: Solve for x
    x = 439,105.89/619.43
  6. Step 6: Final answer
    x = 708.89

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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.