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Finding the Fourth Proportional to 685.91, 1,028.97 and 361.30

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Solution

The fourth proportional to 685.91, 1,028.97 and 361.30 is: 542.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.91 : 1,028.97 = 361.30 : x
  2. Step 2: Convert to fraction form
    685.91/1,028.97 = 361.30/x
  3. Step 3: Cross multiply
    685.91x = 1,028.97 × 361.30
  4. Step 4: Simplify right side
    685.91x = 371,766.86
  5. Step 5: Solve for x
    x = 371,766.86/685.91
  6. Step 6: Final answer
    x = 542.01

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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.