Home / 1,420.28-2,131.46-727.53

Finding the Fourth Proportional to 1,420.28, 2,131.46 and 727.53

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Solution

The fourth proportional to 1,420.28, 2,131.46 and 727.53 is: 1,091.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.28 : 2,131.46 = 727.53 : x
  2. Step 2: Convert to fraction form
    1,420.28/2,131.46 = 727.53/x
  3. Step 3: Cross multiply
    1,420.28x = 2,131.46 × 727.53
  4. Step 4: Simplify right side
    1,420.28x = 1,550,701.09
  5. Step 5: Solve for x
    x = 1,550,701.09/1,420.28
  6. Step 6: Final answer
    x = 1,091.83

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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.