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Finding the Fourth Proportional to 682.74, 942.21 and 388.08

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Solution

The fourth proportional to 682.74, 942.21 and 388.08 is: 535.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.74 : 942.21 = 388.08 : x
  2. Step 2: Convert to fraction form
    682.74/942.21 = 388.08/x
  3. Step 3: Cross multiply
    682.74x = 942.21 × 388.08
  4. Step 4: Simplify right side
    682.74x = 365,652.86
  5. Step 5: Solve for x
    x = 365,652.86/682.74
  6. Step 6: Final answer
    x = 535.57

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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.