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Finding the Fourth Proportional to 1,890.65, 2,835.51 and 720.81

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Solution

The fourth proportional to 1,890.65, 2,835.51 and 720.81 is: 1,081.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,890.65 : 2,835.51 = 720.81 : x
  2. Step 2: Convert to fraction form
    1,890.65/2,835.51 = 720.81/x
  3. Step 3: Cross multiply
    1,890.65x = 2,835.51 × 720.81
  4. Step 4: Simplify right side
    1,890.65x = 2,043,863.96
  5. Step 5: Solve for x
    x = 2,043,863.96/1,890.65
  6. Step 6: Final answer
    x = 1,081.04

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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.