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Finding the Fourth Proportional to 2,170.78, 3,256.49 and 872.17

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Solution

The fourth proportional to 2,170.78, 3,256.49 and 872.17 is: 1,308.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,170.78 : 3,256.49 = 872.17 : x
  2. Step 2: Convert to fraction form
    2,170.78/3,256.49 = 872.17/x
  3. Step 3: Cross multiply
    2,170.78x = 3,256.49 × 872.17
  4. Step 4: Simplify right side
    2,170.78x = 2,840,212.88
  5. Step 5: Solve for x
    x = 2,840,212.88/2,170.78
  6. Step 6: Final answer
    x = 1,308.38

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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.