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Finding the Fourth Proportional to 685.29, 1,028.09 and 548.58

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Solution

The fourth proportional to 685.29, 1,028.09 and 548.58 is: 822.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.29 : 1,028.09 = 548.58 : x
  2. Step 2: Convert to fraction form
    685.29/1,028.09 = 548.58/x
  3. Step 3: Cross multiply
    685.29x = 1,028.09 × 548.58
  4. Step 4: Simplify right side
    685.29x = 563,989.61
  5. Step 5: Solve for x
    x = 563,989.61/685.29
  6. Step 6: Final answer
    x = 822.99

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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.