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Finding the Fourth Proportional to 1,960.65, 2,939.76 and 920.88

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Solution

The fourth proportional to 1,960.65, 2,939.76 and 920.88 is: 1,380.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,960.65 : 2,939.76 = 920.88 : x
  2. Step 2: Convert to fraction form
    1,960.65/2,939.76 = 920.88/x
  3. Step 3: Cross multiply
    1,960.65x = 2,939.76 × 920.88
  4. Step 4: Simplify right side
    1,960.65x = 2,707,166.19
  5. Step 5: Solve for x
    x = 2,707,166.19/1,960.65
  6. Step 6: Final answer
    x = 1,380.75

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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.