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Finding the Fourth Proportional to 812.73, 1,121.40 and 480.99

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Solution

The fourth proportional to 812.73, 1,121.40 and 480.99 is: 663.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.73 : 1,121.40 = 480.99 : x
  2. Step 2: Convert to fraction form
    812.73/1,121.40 = 480.99/x
  3. Step 3: Cross multiply
    812.73x = 1,121.40 × 480.99
  4. Step 4: Simplify right side
    812.73x = 539,382.19
  5. Step 5: Solve for x
    x = 539,382.19/812.73
  6. Step 6: Final answer
    x = 663.67

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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.