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Finding the Fourth Proportional to 2,613.84, 3,920.47 and 764.97

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Solution

The fourth proportional to 2,613.84, 3,920.47 and 764.97 is: 1,147.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,613.84 : 3,920.47 = 764.97 : x
  2. Step 2: Convert to fraction form
    2,613.84/3,920.47 = 764.97/x
  3. Step 3: Cross multiply
    2,613.84x = 3,920.47 × 764.97
  4. Step 4: Simplify right side
    2,613.84x = 2,999,040.02
  5. Step 5: Solve for x
    x = 2,999,040.02/2,613.84
  6. Step 6: Final answer
    x = 1,147.37

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1.5x scale

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.