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Finding the Fourth Proportional to 1,939.12, 2,908.67 and 842.87

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Solution

The fourth proportional to 1,939.12, 2,908.67 and 842.87 is: 1,264.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.12 : 2,908.67 = 842.87 : x
  2. Step 2: Convert to fraction form
    1,939.12/2,908.67 = 842.87/x
  3. Step 3: Cross multiply
    1,939.12x = 2,908.67 × 842.87
  4. Step 4: Simplify right side
    1,939.12x = 2,451,633.74
  5. Step 5: Solve for x
    x = 2,451,633.74/1,939.12
  6. Step 6: Final answer
    x = 1,264.30

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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.