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Finding the Fourth Proportional to 1,961.19, 2,939.67 and 920.31

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Solution

The fourth proportional to 1,961.19, 2,939.67 and 920.31 is: 1,379.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,961.19 : 2,939.67 = 920.31 : x
  2. Step 2: Convert to fraction form
    1,961.19/2,939.67 = 920.31/x
  3. Step 3: Cross multiply
    1,961.19x = 2,939.67 × 920.31
  4. Step 4: Simplify right side
    1,961.19x = 2,705,407.70
  5. Step 5: Solve for x
    x = 2,705,407.70/1,961.19
  6. Step 6: Final answer
    x = 1,379.47

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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.