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Finding the Fourth Proportional to 685.69, 1,028.60 and 274.73

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Solution

The fourth proportional to 685.69, 1,028.60 and 274.73 is: 412.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.69 : 1,028.60 = 274.73 : x
  2. Step 2: Convert to fraction form
    685.69/1,028.60 = 274.73/x
  3. Step 3: Cross multiply
    685.69x = 1,028.60 × 274.73
  4. Step 4: Simplify right side
    685.69x = 282,587.28
  5. Step 5: Solve for x
    x = 282,587.28/685.69
  6. Step 6: Final answer
    x = 412.12

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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.