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Finding the Fourth Proportional to 825.96, 1,138.74 and 691.44

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Solution

The fourth proportional to 825.96, 1,138.74 and 691.44 is: 953.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.96 : 1,138.74 = 691.44 : x
  2. Step 2: Convert to fraction form
    825.96/1,138.74 = 691.44/x
  3. Step 3: Cross multiply
    825.96x = 1,138.74 × 691.44
  4. Step 4: Simplify right side
    825.96x = 787,370.39
  5. Step 5: Solve for x
    x = 787,370.39/825.96
  6. Step 6: Final answer
    x = 953.28

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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.