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Finding the Fourth Proportional to 1,821.56, 2,731.26 and 665.96

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Solution

The fourth proportional to 1,821.56, 2,731.26 and 665.96 is: 998.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,821.56 : 2,731.26 = 665.96 : x
  2. Step 2: Convert to fraction form
    1,821.56/2,731.26 = 665.96/x
  3. Step 3: Cross multiply
    1,821.56x = 2,731.26 × 665.96
  4. Step 4: Simplify right side
    1,821.56x = 1,818,909.91
  5. Step 5: Solve for x
    x = 1,818,909.91/1,821.56
  6. Step 6: Final answer
    x = 998.55

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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.