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Finding the Fourth Proportional to 986.78, 1,361.83 and 692.75

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Solution

The fourth proportional to 986.78, 1,361.83 and 692.75 is: 956.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.78 : 1,361.83 = 692.75 : x
  2. Step 2: Convert to fraction form
    986.78/1,361.83 = 692.75/x
  3. Step 3: Cross multiply
    986.78x = 1,361.83 × 692.75
  4. Step 4: Simplify right side
    986.78x = 943,407.73
  5. Step 5: Solve for x
    x = 943,407.73/986.78
  6. Step 6: Final answer
    x = 956.05

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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.