Home / 3,422.40-5,136.80-1,780.08

Finding the Fourth Proportional to 3,422.40, 5,136.80 and 1,780.08

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Solution

The fourth proportional to 3,422.40, 5,136.80 and 1,780.08 is: 2,671.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,422.40 : 5,136.80 = 1,780.08 : x
  2. Step 2: Convert to fraction form
    3,422.40/5,136.80 = 1,780.08/x
  3. Step 3: Cross multiply
    3,422.40x = 5,136.80 × 1,780.08
  4. Step 4: Simplify right side
    3,422.40x = 9,143,914.94
  5. Step 5: Solve for x
    x = 9,143,914.94/3,422.40
  6. Step 6: Final answer
    x = 2,671.78

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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.