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Finding the Fourth Proportional to 812.70, 1,216.62 and 551.21

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Solution

The fourth proportional to 812.70, 1,216.62 and 551.21 is: 825.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.70 : 1,216.62 = 551.21 : x
  2. Step 2: Convert to fraction form
    812.70/1,216.62 = 551.21/x
  3. Step 3: Cross multiply
    812.70x = 1,216.62 × 551.21
  4. Step 4: Simplify right side
    812.70x = 670,607.03
  5. Step 5: Solve for x
    x = 670,607.03/812.70
  6. Step 6: Final answer
    x = 825.16

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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.