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Finding the Fourth Proportional to 551.06, 755.82 and 485.45

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Solution

The fourth proportional to 551.06, 755.82 and 485.45 is: 665.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.06 : 755.82 = 485.45 : x
  2. Step 2: Convert to fraction form
    551.06/755.82 = 485.45/x
  3. Step 3: Cross multiply
    551.06x = 755.82 × 485.45
  4. Step 4: Simplify right side
    551.06x = 366,912.82
  5. Step 5: Solve for x
    x = 366,912.82/551.06
  6. Step 6: Final answer
    x = 665.83

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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.