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Finding the Fourth Proportional to 2,686.70, 3,691.94 and 2,188.28

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Solution

The fourth proportional to 2,686.70, 3,691.94 and 2,188.28 is: 3,007.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,686.70 : 3,691.94 = 2,188.28 : x
  2. Step 2: Convert to fraction form
    2,686.70/3,691.94 = 2,188.28/x
  3. Step 3: Cross multiply
    2,686.70x = 3,691.94 × 2,188.28
  4. Step 4: Simplify right side
    2,686.70x = 8,078,998.46
  5. Step 5: Solve for x
    x = 8,078,998.46/2,686.70
  6. Step 6: Final answer
    x = 3,007.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.