Home / 1,871.28-2,809.44-1,213.20

Finding the Fourth Proportional to 1,871.28, 2,809.44 and 1,213.20

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Solution

The fourth proportional to 1,871.28, 2,809.44 and 1,213.20 is: 1,821.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,871.28 : 2,809.44 = 1,213.20 : x
  2. Step 2: Convert to fraction form
    1,871.28/2,809.44 = 1,213.20/x
  3. Step 3: Cross multiply
    1,871.28x = 2,809.44 × 1,213.20
  4. Step 4: Simplify right side
    1,871.28x = 3,408,412.61
  5. Step 5: Solve for x
    x = 3,408,412.61/1,871.28
  6. Step 6: Final answer
    x = 1,821.43

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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.