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Finding the Fourth Proportional to 2,711.28, 4,066.57 and 763.64

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Solution

The fourth proportional to 2,711.28, 4,066.57 and 763.64 is: 1,145.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,711.28 : 4,066.57 = 763.64 : x
  2. Step 2: Convert to fraction form
    2,711.28/4,066.57 = 763.64/x
  3. Step 3: Cross multiply
    2,711.28x = 4,066.57 × 763.64
  4. Step 4: Simplify right side
    2,711.28x = 3,105,387.09
  5. Step 5: Solve for x
    x = 3,105,387.09/2,711.28
  6. Step 6: Final answer
    x = 1,145.36

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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.