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Finding the Fourth Proportional to 812.13, 1,121.21 and 625.25

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Solution

The fourth proportional to 812.13, 1,121.21 and 625.25 is: 863.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.13 : 1,121.21 = 625.25 : x
  2. Step 2: Convert to fraction form
    812.13/1,121.21 = 625.25/x
  3. Step 3: Cross multiply
    812.13x = 1,121.21 × 625.25
  4. Step 4: Simplify right side
    812.13x = 701,038.57
  5. Step 5: Solve for x
    x = 701,038.57/812.13
  6. Step 6: Final answer
    x = 863.21

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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.