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Finding the Fourth Proportional to 1,939.29, 2,910.12 and 769.08

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Solution

The fourth proportional to 1,939.29, 2,910.12 and 769.08 is: 1,154.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.29 : 2,910.12 = 769.08 : x
  2. Step 2: Convert to fraction form
    1,939.29/2,910.12 = 769.08/x
  3. Step 3: Cross multiply
    1,939.29x = 2,910.12 × 769.08
  4. Step 4: Simplify right side
    1,939.29x = 2,238,115.09
  5. Step 5: Solve for x
    x = 2,238,115.09/1,939.29
  6. Step 6: Final answer
    x = 1,154.09

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1.5x scale

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.