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Finding the Fourth Proportional to 825.49, 1,137.90 and 563.05

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Solution

The fourth proportional to 825.49, 1,137.90 and 563.05 is: 776.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.49 : 1,137.90 = 563.05 : x
  2. Step 2: Convert to fraction form
    825.49/1,137.90 = 563.05/x
  3. Step 3: Cross multiply
    825.49x = 1,137.90 × 563.05
  4. Step 4: Simplify right side
    825.49x = 640,694.60
  5. Step 5: Solve for x
    x = 640,694.60/825.49
  6. Step 6: Final answer
    x = 776.14

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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.