Home / 2,812.08-4,221-1,991.28

Finding the Fourth Proportional to 2,812.08, 4,221 and 1,991.28

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Solution

The fourth proportional to 2,812.08, 4,221 and 1,991.28 is: 2,988.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,812.08 : 4,221 = 1,991.28 : x
  2. Step 2: Convert to fraction form
    2,812.08/4,221 = 1,991.28/x
  3. Step 3: Cross multiply
    2,812.08x = 4,221 × 1,991.28
  4. Step 4: Simplify right side
    2,812.08x = 8,405,192.88
  5. Step 5: Solve for x
    x = 8,405,192.88/2,812.08
  6. Step 6: Final answer
    x = 2,988.96

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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.