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Finding the Fourth Proportional to 5,385.93, 8,078.91 and 2,921.91

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Solution

The fourth proportional to 5,385.93, 8,078.91 and 2,921.91 is: 4,382.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,385.93 : 8,078.91 = 2,921.91 : x
  2. Step 2: Convert to fraction form
    5,385.93/8,078.91 = 2,921.91/x
  3. Step 3: Cross multiply
    5,385.93x = 8,078.91 × 2,921.91
  4. Step 4: Simplify right side
    5,385.93x = 23,605,847.92
  5. Step 5: Solve for x
    x = 23,605,847.92/5,385.93
  6. Step 6: Final answer
    x = 4,382.87

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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.