Home / 1,215.24-1,821.31-521.08

Finding the Fourth Proportional to 1,215.24, 1,821.31 and 521.08

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Solution

The fourth proportional to 1,215.24, 1,821.31 and 521.08 is: 780.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.24 : 1,821.31 = 521.08 : x
  2. Step 2: Convert to fraction form
    1,215.24/1,821.31 = 521.08/x
  3. Step 3: Cross multiply
    1,215.24x = 1,821.31 × 521.08
  4. Step 4: Simplify right side
    1,215.24x = 949,042.36
  5. Step 5: Solve for x
    x = 949,042.36/1,215.24
  6. Step 6: Final answer
    x = 780.95

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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.