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Finding the Fourth Proportional to 812.18, 1,216.20 and 446.55

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Solution

The fourth proportional to 812.18, 1,216.20 and 446.55 is: 668.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.18 : 1,216.20 = 446.55 : x
  2. Step 2: Convert to fraction form
    812.18/1,216.20 = 446.55/x
  3. Step 3: Cross multiply
    812.18x = 1,216.20 × 446.55
  4. Step 4: Simplify right side
    812.18x = 543,094.11
  5. Step 5: Solve for x
    x = 543,094.11/812.18
  6. Step 6: Final answer
    x = 668.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.