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Finding the Fourth Proportional to 1,912.39, 2,870.91 and 1,815.51

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Solution

The fourth proportional to 1,912.39, 2,870.91 and 1,815.51 is: 2,725.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.39 : 2,870.91 = 1,815.51 : x
  2. Step 2: Convert to fraction form
    1,912.39/2,870.91 = 1,815.51/x
  3. Step 3: Cross multiply
    1,912.39x = 2,870.91 × 1,815.51
  4. Step 4: Simplify right side
    1,912.39x = 5,212,176.58
  5. Step 5: Solve for x
    x = 5,212,176.58/1,912.39
  6. Step 6: Final answer
    x = 2,725.47

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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.