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Finding the Fourth Proportional to 986.02, 1,361.28 and 764.56

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Solution

The fourth proportional to 986.02, 1,361.28 and 764.56 is: 1,055.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.02 : 1,361.28 = 764.56 : x
  2. Step 2: Convert to fraction form
    986.02/1,361.28 = 764.56/x
  3. Step 3: Cross multiply
    986.02x = 1,361.28 × 764.56
  4. Step 4: Simplify right side
    986.02x = 1,040,780.24
  5. Step 5: Solve for x
    x = 1,040,780.24/986.02
  6. Step 6: Final answer
    x = 1,055.54

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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.