Home / 1,406.90-2,107.78-1,187.62

Finding the Fourth Proportional to 1,406.90, 2,107.78 and 1,187.62

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Solution

The fourth proportional to 1,406.90, 2,107.78 and 1,187.62 is: 1,779.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,406.90 : 2,107.78 = 1,187.62 : x
  2. Step 2: Convert to fraction form
    1,406.90/2,107.78 = 1,187.62/x
  3. Step 3: Cross multiply
    1,406.90x = 2,107.78 × 1,187.62
  4. Step 4: Simplify right side
    1,406.90x = 2,503,241.68
  5. Step 5: Solve for x
    x = 2,503,241.68/1,406.90
  6. Step 6: Final answer
    x = 1,779.26

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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.