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Finding the Fourth Proportional to 1,885.30, 2,828.40 and 789.06

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Solution

The fourth proportional to 1,885.30, 2,828.40 and 789.06 is: 1,183.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,885.30 : 2,828.40 = 789.06 : x
  2. Step 2: Convert to fraction form
    1,885.30/2,828.40 = 789.06/x
  3. Step 3: Cross multiply
    1,885.30x = 2,828.40 × 789.06
  4. Step 4: Simplify right side
    1,885.30x = 2,231,777.30
  5. Step 5: Solve for x
    x = 2,231,777.30/1,885.30
  6. Step 6: Final answer
    x = 1,183.78

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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.