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Finding the Fourth Proportional to 845.78, 1,268.43 and 268.64

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Solution

The fourth proportional to 845.78, 1,268.43 and 268.64 is: 402.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.78 : 1,268.43 = 268.64 : x
  2. Step 2: Convert to fraction form
    845.78/1,268.43 = 268.64/x
  3. Step 3: Cross multiply
    845.78x = 1,268.43 × 268.64
  4. Step 4: Simplify right side
    845.78x = 340,751.04
  5. Step 5: Solve for x
    x = 340,751.04/845.78
  6. Step 6: Final answer
    x = 402.88

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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.