Home / 1,869.72-2,791.40-1,428.64

Finding the Fourth Proportional to 1,869.72, 2,791.40 and 1,428.64

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Solution

The fourth proportional to 1,869.72, 2,791.40 and 1,428.64 is: 2,132.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,869.72 : 2,791.40 = 1,428.64 : x
  2. Step 2: Convert to fraction form
    1,869.72/2,791.40 = 1,428.64/x
  3. Step 3: Cross multiply
    1,869.72x = 2,791.40 × 1,428.64
  4. Step 4: Simplify right side
    1,869.72x = 3,987,905.70
  5. Step 5: Solve for x
    x = 3,987,905.70/1,869.72
  6. Step 6: Final answer
    x = 2,132.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.