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Finding the Fourth Proportional to 986.58, 1,362.02 and 789.75

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Solution

The fourth proportional to 986.58, 1,362.02 and 789.75 is: 1,090.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.58 : 1,362.02 = 789.75 : x
  2. Step 2: Convert to fraction form
    986.58/1,362.02 = 789.75/x
  3. Step 3: Cross multiply
    986.58x = 1,362.02 × 789.75
  4. Step 4: Simplify right side
    986.58x = 1,075,651.35
  5. Step 5: Solve for x
    x = 1,075,651.35/986.58
  6. Step 6: Final answer
    x = 1,090.28

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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.