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Finding the Fourth Proportional to 1,891.20, 2,835.44 and 721.12

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Solution

The fourth proportional to 1,891.20, 2,835.44 and 721.12 is: 1,081.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,891.20 : 2,835.44 = 721.12 : x
  2. Step 2: Convert to fraction form
    1,891.20/2,835.44 = 721.12/x
  3. Step 3: Cross multiply
    1,891.20x = 2,835.44 × 721.12
  4. Step 4: Simplify right side
    1,891.20x = 2,044,692.49
  5. Step 5: Solve for x
    x = 2,044,692.49/1,891.20
  6. Step 6: Final answer
    x = 1,081.16

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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.