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Finding the Fourth Proportional to 3,186.44, 4,781 and 1,240

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Solution

The fourth proportional to 3,186.44, 4,781 and 1,240 is: 1,860.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,186.44 : 4,781 = 1,240 : x
  2. Step 2: Convert to fraction form
    3,186.44/4,781 = 1,240/x
  3. Step 3: Cross multiply
    3,186.44x = 4,781 × 1,240
  4. Step 4: Simplify right side
    3,186.44x = 5,928,440
  5. Step 5: Solve for x
    x = 5,928,440/3,186.44
  6. Step 6: Final answer
    x = 1,860.52

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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.