Home / 2,172.56-3,258.90-939.11

Finding the Fourth Proportional to 2,172.56, 3,258.90 and 939.11

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Solution

The fourth proportional to 2,172.56, 3,258.90 and 939.11 is: 1,408.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.56 : 3,258.90 = 939.11 : x
  2. Step 2: Convert to fraction form
    2,172.56/3,258.90 = 939.11/x
  3. Step 3: Cross multiply
    2,172.56x = 3,258.90 × 939.11
  4. Step 4: Simplify right side
    2,172.56x = 3,060,449.28
  5. Step 5: Solve for x
    x = 3,060,449.28/2,172.56
  6. Step 6: Final answer
    x = 1,408.69

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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.