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Finding the Fourth Proportional to 2,613.40, 3,920.23 and 764.47

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Solution

The fourth proportional to 2,613.40, 3,920.23 and 764.47 is: 1,146.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,613.40 : 3,920.23 = 764.47 : x
  2. Step 2: Convert to fraction form
    2,613.40/3,920.23 = 764.47/x
  3. Step 3: Cross multiply
    2,613.40x = 3,920.23 × 764.47
  4. Step 4: Simplify right side
    2,613.40x = 2,996,904.08
  5. Step 5: Solve for x
    x = 2,996,904.08/2,613.40
  6. Step 6: Final answer
    x = 1,146.75

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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.