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Finding the Fourth Proportional to 2,076.78, 3,115.70 and 690.11

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Solution

The fourth proportional to 2,076.78, 3,115.70 and 690.11 is: 1,035.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,076.78 : 3,115.70 = 690.11 : x
  2. Step 2: Convert to fraction form
    2,076.78/3,115.70 = 690.11/x
  3. Step 3: Cross multiply
    2,076.78x = 3,115.70 × 690.11
  4. Step 4: Simplify right side
    2,076.78x = 2,150,175.73
  5. Step 5: Solve for x
    x = 2,150,175.73/2,076.78
  6. Step 6: Final answer
    x = 1,035.34

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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.