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Finding the Fourth Proportional to 986.45, 1,361.58 and 691.79

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Solution

The fourth proportional to 986.45, 1,361.58 and 691.79 is: 954.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.45 : 1,361.58 = 691.79 : x
  2. Step 2: Convert to fraction form
    986.45/1,361.58 = 691.79/x
  3. Step 3: Cross multiply
    986.45x = 1,361.58 × 691.79
  4. Step 4: Simplify right side
    986.45x = 941,927.43
  5. Step 5: Solve for x
    x = 941,927.43/986.45
  6. Step 6: Final answer
    x = 954.87

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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.