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Finding the Fourth Proportional to 2,076.70, 3,115.94 and 690.22

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Solution

The fourth proportional to 2,076.70, 3,115.94 and 690.22 is: 1,035.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,076.70 : 3,115.94 = 690.22 : x
  2. Step 2: Convert to fraction form
    2,076.70/3,115.94 = 690.22/x
  3. Step 3: Cross multiply
    2,076.70x = 3,115.94 × 690.22
  4. Step 4: Simplify right side
    2,076.70x = 2,150,684.11
  5. Step 5: Solve for x
    x = 2,150,684.11/2,076.70
  6. Step 6: Final answer
    x = 1,035.63

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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.