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Finding the Fourth Proportional to 2,138.96, 3,208.86 and 906.36

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Solution

The fourth proportional to 2,138.96, 3,208.86 and 906.36 is: 1,359.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.96 : 3,208.86 = 906.36 : x
  2. Step 2: Convert to fraction form
    2,138.96/3,208.86 = 906.36/x
  3. Step 3: Cross multiply
    2,138.96x = 3,208.86 × 906.36
  4. Step 4: Simplify right side
    2,138.96x = 2,908,382.35
  5. Step 5: Solve for x
    x = 2,908,382.35/2,138.96
  6. Step 6: Final answer
    x = 1,359.72

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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.