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Finding the Fourth Proportional to 812.75, 1,121.64 and 481.37

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Solution

The fourth proportional to 812.75, 1,121.64 and 481.37 is: 664.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.75 : 1,121.64 = 481.37 : x
  2. Step 2: Convert to fraction form
    812.75/1,121.64 = 481.37/x
  3. Step 3: Cross multiply
    812.75x = 1,121.64 × 481.37
  4. Step 4: Simplify right side
    812.75x = 539,923.85
  5. Step 5: Solve for x
    x = 539,923.85/812.75
  6. Step 6: Final answer
    x = 664.32

Related Problems

Find fourth proportional to 406.38, 560.82 and 240.69
Half scale
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Double scale
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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.