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Finding the Fourth Proportional to 1,216.72, 1,823.16 and 825.34

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Solution

The fourth proportional to 1,216.72, 1,823.16 and 825.34 is: 1,236.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.72 : 1,823.16 = 825.34 : x
  2. Step 2: Convert to fraction form
    1,216.72/1,823.16 = 825.34/x
  3. Step 3: Cross multiply
    1,216.72x = 1,823.16 × 825.34
  4. Step 4: Simplify right side
    1,216.72x = 1,504,724.19
  5. Step 5: Solve for x
    x = 1,504,724.19/1,216.72
  6. Step 6: Final answer
    x = 1,236.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.