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Finding the Fourth Proportional to 812.48, 1,212.09 and 790.16

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Solution

The fourth proportional to 812.48, 1,212.09 and 790.16 is: 1,178.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.48 : 1,212.09 = 790.16 : x
  2. Step 2: Convert to fraction form
    812.48/1,212.09 = 790.16/x
  3. Step 3: Cross multiply
    812.48x = 1,212.09 × 790.16
  4. Step 4: Simplify right side
    812.48x = 957,745.03
  5. Step 5: Solve for x
    x = 957,745.03/812.48
  6. Step 6: Final answer
    x = 1,178.79

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.