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Finding the Fourth Proportional to 1,815.35, 2,721.94 and 719.11

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Solution

The fourth proportional to 1,815.35, 2,721.94 and 719.11 is: 1,078.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,815.35 : 2,721.94 = 719.11 : x
  2. Step 2: Convert to fraction form
    1,815.35/2,721.94 = 719.11/x
  3. Step 3: Cross multiply
    1,815.35x = 2,721.94 × 719.11
  4. Step 4: Simplify right side
    1,815.35x = 1,957,375.88
  5. Step 5: Solve for x
    x = 1,957,375.88/1,815.35
  6. Step 6: Final answer
    x = 1,078.24

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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.