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Finding the Fourth Proportional to 2,919.65, 4,379.43 and 728.40

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Solution

The fourth proportional to 2,919.65, 4,379.43 and 728.40 is: 1,092.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,919.65 : 4,379.43 = 728.40 : x
  2. Step 2: Convert to fraction form
    2,919.65/4,379.43 = 728.40/x
  3. Step 3: Cross multiply
    2,919.65x = 4,379.43 × 728.40
  4. Step 4: Simplify right side
    2,919.65x = 3,189,976.81
  5. Step 5: Solve for x
    x = 3,189,976.81/2,919.65
  6. Step 6: Final answer
    x = 1,092.59

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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.