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Finding the Fourth Proportional to 682.90, 942.46 and 388.22

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Solution

The fourth proportional to 682.90, 942.46 and 388.22 is: 535.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.90 : 942.46 = 388.22 : x
  2. Step 2: Convert to fraction form
    682.90/942.46 = 388.22/x
  3. Step 3: Cross multiply
    682.90x = 942.46 × 388.22
  4. Step 4: Simplify right side
    682.90x = 365,881.82
  5. Step 5: Solve for x
    x = 365,881.82/682.90
  6. Step 6: Final answer
    x = 535.78

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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.