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Finding the Fourth Proportional to 2,728.18, 4,091.77 and 779.91

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Solution

The fourth proportional to 2,728.18, 4,091.77 and 779.91 is: 1,169.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,728.18 : 4,091.77 = 779.91 : x
  2. Step 2: Convert to fraction form
    2,728.18/4,091.77 = 779.91/x
  3. Step 3: Cross multiply
    2,728.18x = 4,091.77 × 779.91
  4. Step 4: Simplify right side
    2,728.18x = 3,191,212.34
  5. Step 5: Solve for x
    x = 3,191,212.34/2,728.18
  6. Step 6: Final answer
    x = 1,169.72

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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.