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Finding the Fourth Proportional to 2,171.76, 3,257.75 and 611.89

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Solution

The fourth proportional to 2,171.76, 3,257.75 and 611.89 is: 917.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,171.76 : 3,257.75 = 611.89 : x
  2. Step 2: Convert to fraction form
    2,171.76/3,257.75 = 611.89/x
  3. Step 3: Cross multiply
    2,171.76x = 3,257.75 × 611.89
  4. Step 4: Simplify right side
    2,171.76x = 1,993,378.03
  5. Step 5: Solve for x
    x = 1,993,378.03/2,171.76
  6. Step 6: Final answer
    x = 917.86

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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.