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Finding the Fourth Proportional to 812.53, 1,121.69 and 551.92

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Solution

The fourth proportional to 812.53, 1,121.69 and 551.92 is: 761.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.53 : 1,121.69 = 551.92 : x
  2. Step 2: Convert to fraction form
    812.53/1,121.69 = 551.92/x
  3. Step 3: Cross multiply
    812.53x = 1,121.69 × 551.92
  4. Step 4: Simplify right side
    812.53x = 619,083.14
  5. Step 5: Solve for x
    x = 619,083.14/812.53
  6. Step 6: Final answer
    x = 761.92

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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.