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Finding the Fourth Proportional to 682.79, 942.21 and 388.04

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Solution

The fourth proportional to 682.79, 942.21 and 388.04 is: 535.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.79 : 942.21 = 388.04 : x
  2. Step 2: Convert to fraction form
    682.79/942.21 = 388.04/x
  3. Step 3: Cross multiply
    682.79x = 942.21 × 388.04
  4. Step 4: Simplify right side
    682.79x = 365,610.46
  5. Step 5: Solve for x
    x = 365,610.46/682.79
  6. Step 6: Final answer
    x = 535.47

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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.