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Finding the Fourth Proportional to 2,171.70, 3,255.21 and 939.69

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Solution

The fourth proportional to 2,171.70, 3,255.21 and 939.69 is: 1,408.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,171.70 : 3,255.21 = 939.69 : x
  2. Step 2: Convert to fraction form
    2,171.70/3,255.21 = 939.69/x
  3. Step 3: Cross multiply
    2,171.70x = 3,255.21 × 939.69
  4. Step 4: Simplify right side
    2,171.70x = 3,058,888.28
  5. Step 5: Solve for x
    x = 3,058,888.28/2,171.70
  6. Step 6: Final answer
    x = 1,408.52

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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.