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Finding the Fourth Proportional to 1,785.96, 2,676.78 and 919.80

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Solution

The fourth proportional to 1,785.96, 2,676.78 and 919.80 is: 1,378.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,785.96 : 2,676.78 = 919.80 : x
  2. Step 2: Convert to fraction form
    1,785.96/2,676.78 = 919.80/x
  3. Step 3: Cross multiply
    1,785.96x = 2,676.78 × 919.80
  4. Step 4: Simplify right side
    1,785.96x = 2,462,102.24
  5. Step 5: Solve for x
    x = 2,462,102.24/1,785.96
  6. Step 6: Final answer
    x = 1,378.59

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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.