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Finding the Fourth Proportional to 1,643.22, 2,461.59 and 819

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Solution

The fourth proportional to 1,643.22, 2,461.59 and 819 is: 1,226.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,643.22 : 2,461.59 = 819 : x
  2. Step 2: Convert to fraction form
    1,643.22/2,461.59 = 819/x
  3. Step 3: Cross multiply
    1,643.22x = 2,461.59 × 819
  4. Step 4: Simplify right side
    1,643.22x = 2,016,042.21
  5. Step 5: Solve for x
    x = 2,016,042.21/1,643.22
  6. Step 6: Final answer
    x = 1,226.89

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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.