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Finding the Fourth Proportional to 1,271.94, 1,754.48 and 991.73

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Solution

The fourth proportional to 1,271.94, 1,754.48 and 991.73 is: 1,367.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.94 : 1,754.48 = 991.73 : x
  2. Step 2: Convert to fraction form
    1,271.94/1,754.48 = 991.73/x
  3. Step 3: Cross multiply
    1,271.94x = 1,754.48 × 991.73
  4. Step 4: Simplify right side
    1,271.94x = 1,739,956.72
  5. Step 5: Solve for x
    x = 1,739,956.72/1,271.94
  6. Step 6: Final answer
    x = 1,367.96

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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.