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Finding the Fourth Proportional to 825.36, 1,229.43 and 787.92

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Solution

The fourth proportional to 825.36, 1,229.43 and 787.92 is: 1,173.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.36 : 1,229.43 = 787.92 : x
  2. Step 2: Convert to fraction form
    825.36/1,229.43 = 787.92/x
  3. Step 3: Cross multiply
    825.36x = 1,229.43 × 787.92
  4. Step 4: Simplify right side
    825.36x = 968,692.49
  5. Step 5: Solve for x
    x = 968,692.49/825.36
  6. Step 6: Final answer
    x = 1,173.66

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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.