Home / 1,939.10-2,909.85-768.91

Finding the Fourth Proportional to 1,939.10, 2,909.85 and 768.91

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Solution

The fourth proportional to 1,939.10, 2,909.85 and 768.91 is: 1,153.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.10 : 2,909.85 = 768.91 : x
  2. Step 2: Convert to fraction form
    1,939.10/2,909.85 = 768.91/x
  3. Step 3: Cross multiply
    1,939.10x = 2,909.85 × 768.91
  4. Step 4: Simplify right side
    1,939.10x = 2,237,394.37
  5. Step 5: Solve for x
    x = 2,237,394.37/1,939.10
  6. Step 6: Final answer
    x = 1,153.83

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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.