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Finding the Fourth Proportional to 1,939.65, 2,910.62 and 769.77

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Solution

The fourth proportional to 1,939.65, 2,910.62 and 769.77 is: 1,155.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.65 : 2,910.62 = 769.77 : x
  2. Step 2: Convert to fraction form
    1,939.65/2,910.62 = 769.77/x
  3. Step 3: Cross multiply
    1,939.65x = 2,910.62 × 769.77
  4. Step 4: Simplify right side
    1,939.65x = 2,240,507.96
  5. Step 5: Solve for x
    x = 2,240,507.96/1,939.65
  6. Step 6: Final answer
    x = 1,155.11

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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.