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Finding the Fourth Proportional to 1,817.49, 2,725.40 and 721.11

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Solution

The fourth proportional to 1,817.49, 2,725.40 and 721.11 is: 1,081.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,817.49 : 2,725.40 = 721.11 : x
  2. Step 2: Convert to fraction form
    1,817.49/2,725.40 = 721.11/x
  3. Step 3: Cross multiply
    1,817.49x = 2,725.40 × 721.11
  4. Step 4: Simplify right side
    1,817.49x = 1,965,315.00
  5. Step 5: Solve for x
    x = 1,965,315.00/1,817.49
  6. Step 6: Final answer
    x = 1,081.33

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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.