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Finding the Fourth Proportional to 868.15, 1,197.94 and 691.56

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Solution

The fourth proportional to 868.15, 1,197.94 and 691.56 is: 954.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.15 : 1,197.94 = 691.56 : x
  2. Step 2: Convert to fraction form
    868.15/1,197.94 = 691.56/x
  3. Step 3: Cross multiply
    868.15x = 1,197.94 × 691.56
  4. Step 4: Simplify right side
    868.15x = 828,439.87
  5. Step 5: Solve for x
    x = 828,439.87/868.15
  6. Step 6: Final answer
    x = 954.26

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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.