Home / 1,215.05-1,821.87-667.09

Finding the Fourth Proportional to 1,215.05, 1,821.87 and 667.09

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Solution

The fourth proportional to 1,215.05, 1,821.87 and 667.09 is: 1,000.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.05 : 1,821.87 = 667.09 : x
  2. Step 2: Convert to fraction form
    1,215.05/1,821.87 = 667.09/x
  3. Step 3: Cross multiply
    1,215.05x = 1,821.87 × 667.09
  4. Step 4: Simplify right side
    1,215.05x = 1,215,351.26
  5. Step 5: Solve for x
    x = 1,215,351.26/1,215.05
  6. Step 6: Final answer
    x = 1,000.25

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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.