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Finding the Fourth Proportional to 2,170.89, 3,256.97 and 872.28

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Solution

The fourth proportional to 2,170.89, 3,256.97 and 872.28 is: 1,308.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,170.89 : 3,256.97 = 872.28 : x
  2. Step 2: Convert to fraction form
    2,170.89/3,256.97 = 872.28/x
  3. Step 3: Cross multiply
    2,170.89x = 3,256.97 × 872.28
  4. Step 4: Simplify right side
    2,170.89x = 2,840,985.43
  5. Step 5: Solve for x
    x = 2,840,985.43/2,170.89
  6. Step 6: Final answer
    x = 1,308.67

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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.