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Finding the Fourth Proportional to 18,708.59, 25,821.43 and 11,540.90

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Solution

The fourth proportional to 18,708.59, 25,821.43 and 11,540.90 is: 15,928.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,708.59 : 25,821.43 = 11,540.90 : x
  2. Step 2: Convert to fraction form
    18,708.59/25,821.43 = 11,540.90/x
  3. Step 3: Cross multiply
    18,708.59x = 25,821.43 × 11,540.90
  4. Step 4: Simplify right side
    18,708.59x = 298,002,541.49
  5. Step 5: Solve for x
    x = 298,002,541.49/18,708.59
  6. Step 6: Final answer
    x = 15,928.65

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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.