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Finding the Fourth Proportional to 2,136.38, 3,206.39 and 838.76

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Solution

The fourth proportional to 2,136.38, 3,206.39 and 838.76 is: 1,258.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,136.38 : 3,206.39 = 838.76 : x
  2. Step 2: Convert to fraction form
    2,136.38/3,206.39 = 838.76/x
  3. Step 3: Cross multiply
    2,136.38x = 3,206.39 × 838.76
  4. Step 4: Simplify right side
    2,136.38x = 2,689,371.45
  5. Step 5: Solve for x
    x = 2,689,371.45/2,136.38
  6. Step 6: Final answer
    x = 1,258.85

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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.