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Finding the Fourth Proportional to 18,685.56, 25,789.14 and 10,728.12

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Solution

The fourth proportional to 18,685.56, 25,789.14 and 10,728.12 is: 14,806.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,685.56 : 25,789.14 = 10,728.12 : x
  2. Step 2: Convert to fraction form
    18,685.56/25,789.14 = 10,728.12/x
  3. Step 3: Cross multiply
    18,685.56x = 25,789.14 × 10,728.12
  4. Step 4: Simplify right side
    18,685.56x = 276,668,988.62
  5. Step 5: Solve for x
    x = 276,668,988.62/18,685.56
  6. Step 6: Final answer
    x = 14,806.57

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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.