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Finding the Fourth Proportional to 12,145.64, 18,221.02 and 3,937

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Solution

The fourth proportional to 12,145.64, 18,221.02 and 3,937 is: 5,906.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,145.64 : 18,221.02 = 3,937 : x
  2. Step 2: Convert to fraction form
    12,145.64/18,221.02 = 3,937/x
  3. Step 3: Cross multiply
    12,145.64x = 18,221.02 × 3,937
  4. Step 4: Simplify right side
    12,145.64x = 71,736,155.74
  5. Step 5: Solve for x
    x = 71,736,155.74/12,145.64
  6. Step 6: Final answer
    x = 5,906.33

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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.