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Finding the Fourth Proportional to 2,812.72, 3,879.12 and 1,817.68

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Solution

The fourth proportional to 2,812.72, 3,879.12 and 1,817.68 is: 2,506.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,812.72 : 3,879.12 = 1,817.68 : x
  2. Step 2: Convert to fraction form
    2,812.72/3,879.12 = 1,817.68/x
  3. Step 3: Cross multiply
    2,812.72x = 3,879.12 × 1,817.68
  4. Step 4: Simplify right side
    2,812.72x = 7,050,998.84
  5. Step 5: Solve for x
    x = 7,050,998.84/2,812.72
  6. Step 6: Final answer
    x = 2,506.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.