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Finding the Fourth Proportional to 2,171.96, 3,257.71 and 611.92

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Solution

The fourth proportional to 2,171.96, 3,257.71 and 611.92 is: 917.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,171.96 : 3,257.71 = 611.92 : x
  2. Step 2: Convert to fraction form
    2,171.96/3,257.71 = 611.92/x
  3. Step 3: Cross multiply
    2,171.96x = 3,257.71 × 611.92
  4. Step 4: Simplify right side
    2,171.96x = 1,993,457.90
  5. Step 5: Solve for x
    x = 1,993,457.90/2,171.96
  6. Step 6: Final answer
    x = 917.82

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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.