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Finding the Fourth Proportional to 1,890.82, 2,836.14 and 720.82

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Solution

The fourth proportional to 1,890.82, 2,836.14 and 720.82 is: 1,081.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,890.82 : 2,836.14 = 720.82 : x
  2. Step 2: Convert to fraction form
    1,890.82/2,836.14 = 720.82/x
  3. Step 3: Cross multiply
    1,890.82x = 2,836.14 × 720.82
  4. Step 4: Simplify right side
    1,890.82x = 2,044,346.43
  5. Step 5: Solve for x
    x = 2,044,346.43/1,890.82
  6. Step 6: Final answer
    x = 1,081.20

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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.