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Finding the Fourth Proportional to 683.30, 942.91 and 388.56

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Solution

The fourth proportional to 683.30, 942.91 and 388.56 is: 536.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.30 : 942.91 = 388.56 : x
  2. Step 2: Convert to fraction form
    683.30/942.91 = 388.56/x
  3. Step 3: Cross multiply
    683.30x = 942.91 × 388.56
  4. Step 4: Simplify right side
    683.30x = 366,379.67
  5. Step 5: Solve for x
    x = 366,379.67/683.30
  6. Step 6: Final answer
    x = 536.19

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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.