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Finding the Fourth Proportional to 12,659.71, 18,987.93 and 3,894.43

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Solution

The fourth proportional to 12,659.71, 18,987.93 and 3,894.43 is: 5,841.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,659.71 : 18,987.93 = 3,894.43 : x
  2. Step 2: Convert to fraction form
    12,659.71/18,987.93 = 3,894.43/x
  3. Step 3: Cross multiply
    12,659.71x = 18,987.93 × 3,894.43
  4. Step 4: Simplify right side
    12,659.71x = 73,947,164.23
  5. Step 5: Solve for x
    x = 73,947,164.23/12,659.71
  6. Step 6: Final answer
    x = 5,841.14

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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.