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Finding the Fourth Proportional to 685.36, 1,028.44 and 361.04

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Solution

The fourth proportional to 685.36, 1,028.44 and 361.04 is: 541.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.36 : 1,028.44 = 361.04 : x
  2. Step 2: Convert to fraction form
    685.36/1,028.44 = 361.04/x
  3. Step 3: Cross multiply
    685.36x = 1,028.44 × 361.04
  4. Step 4: Simplify right side
    685.36x = 371,307.98
  5. Step 5: Solve for x
    x = 371,307.98/685.36
  6. Step 6: Final answer
    x = 541.77

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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.