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Finding the Fourth Proportional to 683.31, 942.87 and 388.56

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Solution

The fourth proportional to 683.31, 942.87 and 388.56 is: 536.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.31 : 942.87 = 388.56 : x
  2. Step 2: Convert to fraction form
    683.31/942.87 = 388.56/x
  3. Step 3: Cross multiply
    683.31x = 942.87 × 388.56
  4. Step 4: Simplify right side
    683.31x = 366,361.57
  5. Step 5: Solve for x
    x = 366,361.57/683.31
  6. Step 6: Final answer
    x = 536.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.