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Finding the Fourth Proportional to 986.20, 1,361.26 and 691.54

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Solution

The fourth proportional to 986.20, 1,361.26 and 691.54 is: 954.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.20 : 1,361.26 = 691.54 : x
  2. Step 2: Convert to fraction form
    986.20/1,361.26 = 691.54/x
  3. Step 3: Cross multiply
    986.20x = 1,361.26 × 691.54
  4. Step 4: Simplify right side
    986.20x = 941,365.74
  5. Step 5: Solve for x
    x = 941,365.74/986.20
  6. Step 6: Final answer
    x = 954.54

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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.