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Finding the Fourth Proportional to 2,919.81, 4,379.73 and 839.85

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Solution

The fourth proportional to 2,919.81, 4,379.73 and 839.85 is: 1,259.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,919.81 : 4,379.73 = 839.85 : x
  2. Step 2: Convert to fraction form
    2,919.81/4,379.73 = 839.85/x
  3. Step 3: Cross multiply
    2,919.81x = 4,379.73 × 839.85
  4. Step 4: Simplify right side
    2,919.81x = 3,678,316.24
  5. Step 5: Solve for x
    x = 3,678,316.24/2,919.81
  6. Step 6: Final answer
    x = 1,259.78

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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.