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Finding the Fourth Proportional to 2,613.39, 3,920.49 and 764.28

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Solution

The fourth proportional to 2,613.39, 3,920.49 and 764.28 is: 1,146.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,613.39 : 3,920.49 = 764.28 : x
  2. Step 2: Convert to fraction form
    2,613.39/3,920.49 = 764.28/x
  3. Step 3: Cross multiply
    2,613.39x = 3,920.49 × 764.28
  4. Step 4: Simplify right side
    2,613.39x = 2,996,352.10
  5. Step 5: Solve for x
    x = 2,996,352.10/2,613.39
  6. Step 6: Final answer
    x = 1,146.54

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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.