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Finding the Fourth Proportional to 683.45, 942.96 and 388.72

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Solution

The fourth proportional to 683.45, 942.96 and 388.72 is: 536.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.45 : 942.96 = 388.72 : x
  2. Step 2: Convert to fraction form
    683.45/942.96 = 388.72/x
  3. Step 3: Cross multiply
    683.45x = 942.96 × 388.72
  4. Step 4: Simplify right side
    683.45x = 366,542.70
  5. Step 5: Solve for x
    x = 366,542.70/683.45
  6. Step 6: Final answer
    x = 536.31

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1.5x scale

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.