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Finding the Fourth Proportional to 1,817.15, 2,726.18 and 721.15

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Solution

The fourth proportional to 1,817.15, 2,726.18 and 721.15 is: 1,081.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,817.15 : 2,726.18 = 721.15 : x
  2. Step 2: Convert to fraction form
    1,817.15/2,726.18 = 721.15/x
  3. Step 3: Cross multiply
    1,817.15x = 2,726.18 × 721.15
  4. Step 4: Simplify right side
    1,817.15x = 1,965,982.90
  5. Step 5: Solve for x
    x = 1,965,982.90/1,817.15
  6. Step 6: Final answer
    x = 1,081.91

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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.