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Finding the Fourth Proportional to 812.59, 1,121.87 and 625.70

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Solution

The fourth proportional to 812.59, 1,121.87 and 625.70 is: 863.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.59 : 1,121.87 = 625.70 : x
  2. Step 2: Convert to fraction form
    812.59/1,121.87 = 625.70/x
  3. Step 3: Cross multiply
    812.59x = 1,121.87 × 625.70
  4. Step 4: Simplify right side
    812.59x = 701,958.43
  5. Step 5: Solve for x
    x = 701,958.43/812.59
  6. Step 6: Final answer
    x = 863.86

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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.