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Finding the Fourth Proportional to 2,689.57, 4,029.82 and 1,905.78

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Solution

The fourth proportional to 2,689.57, 4,029.82 and 1,905.78 is: 2,855.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,689.57 : 4,029.82 = 1,905.78 : x
  2. Step 2: Convert to fraction form
    2,689.57/4,029.82 = 1,905.78/x
  3. Step 3: Cross multiply
    2,689.57x = 4,029.82 × 1,905.78
  4. Step 4: Simplify right side
    2,689.57x = 7,679,938.04
  5. Step 5: Solve for x
    x = 7,679,938.04/2,689.57
  6. Step 6: Final answer
    x = 2,855.45

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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.