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Finding the Fourth Proportional to 13,712.41, 18,921.95 and 7,891.71

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Solution

The fourth proportional to 13,712.41, 18,921.95 and 7,891.71 is: 10,889.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,712.41 : 18,921.95 = 7,891.71 : x
  2. Step 2: Convert to fraction form
    13,712.41/18,921.95 = 7,891.71/x
  3. Step 3: Cross multiply
    13,712.41x = 18,921.95 × 7,891.71
  4. Step 4: Simplify right side
    13,712.41x = 149,326,542.03
  5. Step 5: Solve for x
    x = 149,326,542.03/13,712.41
  6. Step 6: Final answer
    x = 10,889.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.