Home / 1,428.11-2,141.24-939.68

Finding the Fourth Proportional to 1,428.11, 2,141.24 and 939.68

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Solution

The fourth proportional to 1,428.11, 2,141.24 and 939.68 is: 1,408.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.11 : 2,141.24 = 939.68 : x
  2. Step 2: Convert to fraction form
    1,428.11/2,141.24 = 939.68/x
  3. Step 3: Cross multiply
    1,428.11x = 2,141.24 × 939.68
  4. Step 4: Simplify right side
    1,428.11x = 2,012,080.40
  5. Step 5: Solve for x
    x = 2,012,080.40/1,428.11
  6. Step 6: Final answer
    x = 1,408.91

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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.