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Finding the Fourth Proportional to 1,137.98, 1,571.20 and 871.96

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Solution

The fourth proportional to 1,137.98, 1,571.20 and 871.96 is: 1,203.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.98 : 1,571.20 = 871.96 : x
  2. Step 2: Convert to fraction form
    1,137.98/1,571.20 = 871.96/x
  3. Step 3: Cross multiply
    1,137.98x = 1,571.20 × 871.96
  4. Step 4: Simplify right side
    1,137.98x = 1,370,023.55
  5. Step 5: Solve for x
    x = 1,370,023.55/1,137.98
  6. Step 6: Final answer
    x = 1,203.91

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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.