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Finding the Fourth Proportional to 2,057.90, 3,087.15 and 670.89

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Solution

The fourth proportional to 2,057.90, 3,087.15 and 670.89 is: 1,006.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,057.90 : 3,087.15 = 670.89 : x
  2. Step 2: Convert to fraction form
    2,057.90/3,087.15 = 670.89/x
  3. Step 3: Cross multiply
    2,057.90x = 3,087.15 × 670.89
  4. Step 4: Simplify right side
    2,057.90x = 2,071,138.44
  5. Step 5: Solve for x
    x = 2,071,138.44/2,057.90
  6. Step 6: Final answer
    x = 1,006.43

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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.