Home / 2,165.80-3,251.70-1,390.60

Finding the Fourth Proportional to 2,165.80, 3,251.70 and 1,390.60

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Solution

The fourth proportional to 2,165.80, 3,251.70 and 1,390.60 is: 2,087.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,165.80 : 3,251.70 = 1,390.60 : x
  2. Step 2: Convert to fraction form
    2,165.80/3,251.70 = 1,390.60/x
  3. Step 3: Cross multiply
    2,165.80x = 3,251.70 × 1,390.60
  4. Step 4: Simplify right side
    2,165.80x = 4,521,814.02
  5. Step 5: Solve for x
    x = 4,521,814.02/2,165.80
  6. Step 6: Final answer
    x = 2,087.83

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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.