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Finding the Fourth Proportional to 2,411.81, 3,617.97 and 767.78

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Solution

The fourth proportional to 2,411.81, 3,617.97 and 767.78 is: 1,151.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,411.81 : 3,617.97 = 767.78 : x
  2. Step 2: Convert to fraction form
    2,411.81/3,617.97 = 767.78/x
  3. Step 3: Cross multiply
    2,411.81x = 3,617.97 × 767.78
  4. Step 4: Simplify right side
    2,411.81x = 2,777,788.84
  5. Step 5: Solve for x
    x = 2,777,788.84/2,411.81
  6. Step 6: Final answer
    x = 1,151.75

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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.