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Finding the Fourth Proportional to 825.68, 1,138.36 and 685.92

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Solution

The fourth proportional to 825.68, 1,138.36 and 685.92 is: 945.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.68 : 1,138.36 = 685.92 : x
  2. Step 2: Convert to fraction form
    825.68/1,138.36 = 685.92/x
  3. Step 3: Cross multiply
    825.68x = 1,138.36 × 685.92
  4. Step 4: Simplify right side
    825.68x = 780,823.89
  5. Step 5: Solve for x
    x = 780,823.89/825.68
  6. Step 6: Final answer
    x = 945.67

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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.