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Finding the Fourth Proportional to 812.97, 1,121.67 and 551.16

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Solution

The fourth proportional to 812.97, 1,121.67 and 551.16 is: 760.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.97 : 1,121.67 = 551.16 : x
  2. Step 2: Convert to fraction form
    812.97/1,121.67 = 551.16/x
  3. Step 3: Cross multiply
    812.97x = 1,121.67 × 551.16
  4. Step 4: Simplify right side
    812.97x = 618,219.64
  5. Step 5: Solve for x
    x = 618,219.64/812.97
  6. Step 6: Final answer
    x = 760.45

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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.