Home / 1,268.17-1,899.55-720.07

Finding the Fourth Proportional to 1,268.17, 1,899.55 and 720.07

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Solution

The fourth proportional to 1,268.17, 1,899.55 and 720.07 is: 1,078.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.17 : 1,899.55 = 720.07 : x
  2. Step 2: Convert to fraction form
    1,268.17/1,899.55 = 720.07/x
  3. Step 3: Cross multiply
    1,268.17x = 1,899.55 × 720.07
  4. Step 4: Simplify right side
    1,268.17x = 1,367,808.97
  5. Step 5: Solve for x
    x = 1,367,808.97/1,268.17
  6. Step 6: Final answer
    x = 1,078.57

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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.