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Finding the Fourth Proportional to 2,000.78, 3,001.34 and 685.44

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Solution

The fourth proportional to 2,000.78, 3,001.34 and 685.44 is: 1,028.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,000.78 : 3,001.34 = 685.44 : x
  2. Step 2: Convert to fraction form
    2,000.78/3,001.34 = 685.44/x
  3. Step 3: Cross multiply
    2,000.78x = 3,001.34 × 685.44
  4. Step 4: Simplify right side
    2,000.78x = 2,057,240.20
  5. Step 5: Solve for x
    x = 2,057,240.20/2,000.78
  6. Step 6: Final answer
    x = 1,028.22

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1.5x scale

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.