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Finding the Fourth Proportional to 2,172.77, 3,258.47 and 939.39

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Solution

The fourth proportional to 2,172.77, 3,258.47 and 939.39 is: 1,408.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.77 : 3,258.47 = 939.39 : x
  2. Step 2: Convert to fraction form
    2,172.77/3,258.47 = 939.39/x
  3. Step 3: Cross multiply
    2,172.77x = 3,258.47 × 939.39
  4. Step 4: Simplify right side
    2,172.77x = 3,060,974.13
  5. Step 5: Solve for x
    x = 3,060,974.13/2,172.77
  6. Step 6: Final answer
    x = 1,408.79

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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.