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Finding the Fourth Proportional to 2,790.65, 4,185.86 and 842.80

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Solution

The fourth proportional to 2,790.65, 4,185.86 and 842.80 is: 1,264.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,790.65 : 4,185.86 = 842.80 : x
  2. Step 2: Convert to fraction form
    2,790.65/4,185.86 = 842.80/x
  3. Step 3: Cross multiply
    2,790.65x = 4,185.86 × 842.80
  4. Step 4: Simplify right side
    2,790.65x = 3,527,821.88
  5. Step 5: Solve for x
    x = 3,527,821.88/2,790.65
  6. Step 6: Final answer
    x = 1,264.16

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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.