Home / 1,861.35-2,781.39-1,338.90

Finding the Fourth Proportional to 1,861.35, 2,781.39 and 1,338.90

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Solution

The fourth proportional to 1,861.35, 2,781.39 and 1,338.90 is: 2,000.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,861.35 : 2,781.39 = 1,338.90 : x
  2. Step 2: Convert to fraction form
    1,861.35/2,781.39 = 1,338.90/x
  3. Step 3: Cross multiply
    1,861.35x = 2,781.39 × 1,338.90
  4. Step 4: Simplify right side
    1,861.35x = 3,724,003.07
  5. Step 5: Solve for x
    x = 3,724,003.07/1,861.35
  6. Step 6: Final answer
    x = 2,000.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.