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Finding the Fourth Proportional to 2,140.87, 3,208.83 and 906.43

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Solution

The fourth proportional to 2,140.87, 3,208.83 and 906.43 is: 1,358.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,140.87 : 3,208.83 = 906.43 : x
  2. Step 2: Convert to fraction form
    2,140.87/3,208.83 = 906.43/x
  3. Step 3: Cross multiply
    2,140.87x = 3,208.83 × 906.43
  4. Step 4: Simplify right side
    2,140.87x = 2,908,579.78
  5. Step 5: Solve for x
    x = 2,908,579.78/2,140.87
  6. Step 6: Final answer
    x = 1,358.60

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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.