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Finding the Fourth Proportional to 685.23, 1,027.84 and 548.54

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Solution

The fourth proportional to 685.23, 1,027.84 and 548.54 is: 822.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.23 : 1,027.84 = 548.54 : x
  2. Step 2: Convert to fraction form
    685.23/1,027.84 = 548.54/x
  3. Step 3: Cross multiply
    685.23x = 1,027.84 × 548.54
  4. Step 4: Simplify right side
    685.23x = 563,809.73
  5. Step 5: Solve for x
    x = 563,809.73/685.23
  6. Step 6: Final answer
    x = 822.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.