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Finding the Fourth Proportional to 19,891.29, 27,449.99 and 10,939.40

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Solution

The fourth proportional to 19,891.29, 27,449.99 and 10,939.40 is: 15,096.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,891.29 : 27,449.99 = 10,939.40 : x
  2. Step 2: Convert to fraction form
    19,891.29/27,449.99 = 10,939.40/x
  3. Step 3: Cross multiply
    19,891.29x = 27,449.99 × 10,939.40
  4. Step 4: Simplify right side
    19,891.29x = 300,286,420.61
  5. Step 5: Solve for x
    x = 300,286,420.61/19,891.29
  6. Step 6: Final answer
    x = 15,096.38

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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.