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Finding the Fourth Proportional to 621.93, 853.68 and 550.43

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Solution

The fourth proportional to 621.93, 853.68 and 550.43 is: 755.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.93 : 853.68 = 550.43 : x
  2. Step 2: Convert to fraction form
    621.93/853.68 = 550.43/x
  3. Step 3: Cross multiply
    621.93x = 853.68 × 550.43
  4. Step 4: Simplify right side
    621.93x = 469,890.53
  5. Step 5: Solve for x
    x = 469,890.53/621.93
  6. Step 6: Final answer
    x = 755.54

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.