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Finding the Fourth Proportional to 3,921, 5,881.50 and 1,185

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Solution

The fourth proportional to 3,921, 5,881.50 and 1,185 is: 1,777.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,921 : 5,881.50 = 1,185 : x
  2. Step 2: Convert to fraction form
    3,921/5,881.50 = 1,185/x
  3. Step 3: Cross multiply
    3,921x = 5,881.50 × 1,185
  4. Step 4: Simplify right side
    3,921x = 6,969,577.50
  5. Step 5: Solve for x
    x = 6,969,577.50/3,921
  6. Step 6: Final answer
    x = 1,777.50

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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.