Home / 1,215.58-1,821.84-521.80

Finding the Fourth Proportional to 1,215.58, 1,821.84 and 521.80

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Solution

The fourth proportional to 1,215.58, 1,821.84 and 521.80 is: 782.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.58 : 1,821.84 = 521.80 : x
  2. Step 2: Convert to fraction form
    1,215.58/1,821.84 = 521.80/x
  3. Step 3: Cross multiply
    1,215.58x = 1,821.84 × 521.80
  4. Step 4: Simplify right side
    1,215.58x = 950,636.11
  5. Step 5: Solve for x
    x = 950,636.11/1,215.58
  6. Step 6: Final answer
    x = 782.04

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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.