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Finding the Fourth Proportional to 682.92, 942.40 and 388.21

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Solution

The fourth proportional to 682.92, 942.40 and 388.21 is: 535.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.92 : 942.40 = 388.21 : x
  2. Step 2: Convert to fraction form
    682.92/942.40 = 388.21/x
  3. Step 3: Cross multiply
    682.92x = 942.40 × 388.21
  4. Step 4: Simplify right side
    682.92x = 365,845.78
  5. Step 5: Solve for x
    x = 365,845.78/682.92
  6. Step 6: Final answer
    x = 535.71

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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.