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Finding the Fourth Proportional to 2,919.38, 4,379.20 and 728.12

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Solution

The fourth proportional to 2,919.38, 4,379.20 and 728.12 is: 1,092.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,919.38 : 4,379.20 = 728.12 : x
  2. Step 2: Convert to fraction form
    2,919.38/4,379.20 = 728.12/x
  3. Step 3: Cross multiply
    2,919.38x = 4,379.20 × 728.12
  4. Step 4: Simplify right side
    2,919.38x = 3,188,592.23
  5. Step 5: Solve for x
    x = 3,188,592.23/2,919.38
  6. Step 6: Final answer
    x = 1,092.22

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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.