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Finding the Fourth Proportional to 3,878.91, 5,820.75 and 1,687.82

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Solution

The fourth proportional to 3,878.91, 5,820.75 and 1,687.82 is: 2,532.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,878.91 : 5,820.75 = 1,687.82 : x
  2. Step 2: Convert to fraction form
    3,878.91/5,820.75 = 1,687.82/x
  3. Step 3: Cross multiply
    3,878.91x = 5,820.75 × 1,687.82
  4. Step 4: Simplify right side
    3,878.91x = 9,824,349.16
  5. Step 5: Solve for x
    x = 9,824,349.16/3,878.91
  6. Step 6: Final answer
    x = 2,532.76

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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.