Home / 2,115.40-3,171-1,072.30

Finding the Fourth Proportional to 2,115.40, 3,171 and 1,072.30

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Solution

The fourth proportional to 2,115.40, 3,171 and 1,072.30 is: 1,607.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.40 : 3,171 = 1,072.30 : x
  2. Step 2: Convert to fraction form
    2,115.40/3,171 = 1,072.30/x
  3. Step 3: Cross multiply
    2,115.40x = 3,171 × 1,072.30
  4. Step 4: Simplify right side
    2,115.40x = 3,400,263.30
  5. Step 5: Solve for x
    x = 3,400,263.30/2,115.40
  6. Step 6: Final answer
    x = 1,607.39

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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.