Home / 1,428.11-2,142.86-1,243.36

Finding the Fourth Proportional to 1,428.11, 2,142.86 and 1,243.36

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Solution

The fourth proportional to 1,428.11, 2,142.86 and 1,243.36 is: 1,865.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.11 : 2,142.86 = 1,243.36 : x
  2. Step 2: Convert to fraction form
    1,428.11/2,142.86 = 1,243.36/x
  3. Step 3: Cross multiply
    1,428.11x = 2,142.86 × 1,243.36
  4. Step 4: Simplify right side
    1,428.11x = 2,664,342.87
  5. Step 5: Solve for x
    x = 2,664,342.87/1,428.11
  6. Step 6: Final answer
    x = 1,865.64

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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.