Home / 1,215.24-1,676.84-821.88

Finding the Fourth Proportional to 1,215.24, 1,676.84 and 821.88

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Solution

The fourth proportional to 1,215.24, 1,676.84 and 821.88 is: 1,134.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.24 : 1,676.84 = 821.88 : x
  2. Step 2: Convert to fraction form
    1,215.24/1,676.84 = 821.88/x
  3. Step 3: Cross multiply
    1,215.24x = 1,676.84 × 821.88
  4. Step 4: Simplify right side
    1,215.24x = 1,378,148.77
  5. Step 5: Solve for x
    x = 1,378,148.77/1,215.24
  6. Step 6: Final answer
    x = 1,134.06

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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.