Home / 2,156.60-3,231.30-1,425.80

Finding the Fourth Proportional to 2,156.60, 3,231.30 and 1,425.80

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Solution

The fourth proportional to 2,156.60, 3,231.30 and 1,425.80 is: 2,136.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,156.60 : 3,231.30 = 1,425.80 : x
  2. Step 2: Convert to fraction form
    2,156.60/3,231.30 = 1,425.80/x
  3. Step 3: Cross multiply
    2,156.60x = 3,231.30 × 1,425.80
  4. Step 4: Simplify right side
    2,156.60x = 4,607,187.54
  5. Step 5: Solve for x
    x = 4,607,187.54/2,156.60
  6. Step 6: Final answer
    x = 2,136.32

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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.