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Finding the Fourth Proportional to 1,379.76, 2,067.48 and 763.08

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Solution

The fourth proportional to 1,379.76, 2,067.48 and 763.08 is: 1,143.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.76 : 2,067.48 = 763.08 : x
  2. Step 2: Convert to fraction form
    1,379.76/2,067.48 = 763.08/x
  3. Step 3: Cross multiply
    1,379.76x = 2,067.48 × 763.08
  4. Step 4: Simplify right side
    1,379.76x = 1,577,652.64
  5. Step 5: Solve for x
    x = 1,577,652.64/1,379.76
  6. Step 6: Final answer
    x = 1,143.43

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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.