Home / 1,215.17-1,821.96-521.64

Finding the Fourth Proportional to 1,215.17, 1,821.96 and 521.64

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Solution

The fourth proportional to 1,215.17, 1,821.96 and 521.64 is: 782.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.17 : 1,821.96 = 521.64 : x
  2. Step 2: Convert to fraction form
    1,215.17/1,821.96 = 521.64/x
  3. Step 3: Cross multiply
    1,215.17x = 1,821.96 × 521.64
  4. Step 4: Simplify right side
    1,215.17x = 950,407.21
  5. Step 5: Solve for x
    x = 950,407.21/1,215.17
  6. Step 6: Final answer
    x = 782.12

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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.