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Finding the Fourth Proportional to 1,891.60, 2,835.90 and 721.37

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Solution

The fourth proportional to 1,891.60, 2,835.90 and 721.37 is: 1,081.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,891.60 : 2,835.90 = 721.37 : x
  2. Step 2: Convert to fraction form
    1,891.60/2,835.90 = 721.37/x
  3. Step 3: Cross multiply
    1,891.60x = 2,835.90 × 721.37
  4. Step 4: Simplify right side
    1,891.60x = 2,045,740.27
  5. Step 5: Solve for x
    x = 2,045,740.27/1,891.60
  6. Step 6: Final answer
    x = 1,081.49

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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.