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Finding the Fourth Proportional to 1,327.68, 1,991.84 and 840.16

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Solution

The fourth proportional to 1,327.68, 1,991.84 and 840.16 is: 1,260.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327.68 : 1,991.84 = 840.16 : x
  2. Step 2: Convert to fraction form
    1,327.68/1,991.84 = 840.16/x
  3. Step 3: Cross multiply
    1,327.68x = 1,991.84 × 840.16
  4. Step 4: Simplify right side
    1,327.68x = 1,673,464.29
  5. Step 5: Solve for x
    x = 1,673,464.29/1,327.68
  6. Step 6: Final answer
    x = 1,260.44

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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.