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Finding the Fourth Proportional to 1,245.45, 1,716.90 and 871.28

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Solution

The fourth proportional to 1,245.45, 1,716.90 and 871.28 is: 1,201.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.45 : 1,716.90 = 871.28 : x
  2. Step 2: Convert to fraction form
    1,245.45/1,716.90 = 871.28/x
  3. Step 3: Cross multiply
    1,245.45x = 1,716.90 × 871.28
  4. Step 4: Simplify right side
    1,245.45x = 1,495,892.05
  5. Step 5: Solve for x
    x = 1,495,892.05/1,245.45
  6. Step 6: Final answer
    x = 1,201.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.