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Finding the Fourth Proportional to 823.82, 1,137.28 and 563.20

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Solution

The fourth proportional to 823.82, 1,137.28 and 563.20 is: 777.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.82 : 1,137.28 = 563.20 : x
  2. Step 2: Convert to fraction form
    823.82/1,137.28 = 563.20/x
  3. Step 3: Cross multiply
    823.82x = 1,137.28 × 563.20
  4. Step 4: Simplify right side
    823.82x = 640,516.10
  5. Step 5: Solve for x
    x = 640,516.10/823.82
  6. Step 6: Final answer
    x = 777.50

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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.