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Finding the Fourth Proportional to 1,327.90, 1,991.96 and 1,309.91

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Solution

The fourth proportional to 1,327.90, 1,991.96 and 1,309.91 is: 1,964.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327.90 : 1,991.96 = 1,309.91 : x
  2. Step 2: Convert to fraction form
    1,327.90/1,991.96 = 1,309.91/x
  3. Step 3: Cross multiply
    1,327.90x = 1,991.96 × 1,309.91
  4. Step 4: Simplify right side
    1,327.90x = 2,609,288.32
  5. Step 5: Solve for x
    x = 2,609,288.32/1,327.90
  6. Step 6: Final answer
    x = 1,964.97

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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.