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Finding the Fourth Proportional to 3,453.58, 5,178.81 and 987.82

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Solution

The fourth proportional to 3,453.58, 5,178.81 and 987.82 is: 1,481.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,453.58 : 5,178.81 = 987.82 : x
  2. Step 2: Convert to fraction form
    3,453.58/5,178.81 = 987.82/x
  3. Step 3: Cross multiply
    3,453.58x = 5,178.81 × 987.82
  4. Step 4: Simplify right side
    3,453.58x = 5,115,732.09
  5. Step 5: Solve for x
    x = 5,115,732.09/3,453.58
  6. Step 6: Final answer
    x = 1,481.28

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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.