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Finding the Fourth Proportional to 1,396.81, 2,095.55 and 986.75

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Solution

The fourth proportional to 1,396.81, 2,095.55 and 986.75 is: 1,480.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.81 : 2,095.55 = 986.75 : x
  2. Step 2: Convert to fraction form
    1,396.81/2,095.55 = 986.75/x
  3. Step 3: Cross multiply
    1,396.81x = 2,095.55 × 986.75
  4. Step 4: Simplify right side
    1,396.81x = 2,067,783.96
  5. Step 5: Solve for x
    x = 2,067,783.96/1,396.81
  6. Step 6: Final answer
    x = 1,480.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.