Home / 1,215.21-1,676.91-822.36

Finding the Fourth Proportional to 1,215.21, 1,676.91 and 822.36

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Solution

The fourth proportional to 1,215.21, 1,676.91 and 822.36 is: 1,134.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.21 : 1,676.91 = 822.36 : x
  2. Step 2: Convert to fraction form
    1,215.21/1,676.91 = 822.36/x
  3. Step 3: Cross multiply
    1,215.21x = 1,676.91 × 822.36
  4. Step 4: Simplify right side
    1,215.21x = 1,379,023.71
  5. Step 5: Solve for x
    x = 1,379,023.71/1,215.21
  6. Step 6: Final answer
    x = 1,134.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.