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Finding the Fourth Proportional to 812.72, 1,121.20 and 481.02

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Solution

The fourth proportional to 812.72, 1,121.20 and 481.02 is: 663.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.72 : 1,121.20 = 481.02 : x
  2. Step 2: Convert to fraction form
    812.72/1,121.20 = 481.02/x
  3. Step 3: Cross multiply
    812.72x = 1,121.20 × 481.02
  4. Step 4: Simplify right side
    812.72x = 539,319.62
  5. Step 5: Solve for x
    x = 539,319.62/812.72
  6. Step 6: Final answer
    x = 663.60

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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.