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Finding the Fourth Proportional to 812.77, 1,121.57 and 481.07

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Solution

The fourth proportional to 812.77, 1,121.57 and 481.07 is: 663.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.77 : 1,121.57 = 481.07 : x
  2. Step 2: Convert to fraction form
    812.77/1,121.57 = 481.07/x
  3. Step 3: Cross multiply
    812.77x = 1,121.57 × 481.07
  4. Step 4: Simplify right side
    812.77x = 539,551.27
  5. Step 5: Solve for x
    x = 539,551.27/812.77
  6. Step 6: Final answer
    x = 663.85

Related Problems

Find fourth proportional to 406.38, 560.78 and 240.54
Half scale
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Double scale
Find fourth proportional to 813.77, 1,122.94 and 482.07
Similar ratio
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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.