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Finding the Fourth Proportional to 2,809.94, 4,215.78 and 961.04

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Solution

The fourth proportional to 2,809.94, 4,215.78 and 961.04 is: 1,441.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,809.94 : 4,215.78 = 961.04 : x
  2. Step 2: Convert to fraction form
    2,809.94/4,215.78 = 961.04/x
  3. Step 3: Cross multiply
    2,809.94x = 4,215.78 × 961.04
  4. Step 4: Simplify right side
    2,809.94x = 4,051,543.75
  5. Step 5: Solve for x
    x = 4,051,543.75/2,809.94
  6. Step 6: Final answer
    x = 1,441.86

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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.