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Finding the Fourth Proportional to 20,339.88, 30,512.28 and 7,189.56

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Solution

The fourth proportional to 20,339.88, 30,512.28 and 7,189.56 is: 10,785.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,339.88 : 30,512.28 = 7,189.56 : x
  2. Step 2: Convert to fraction form
    20,339.88/30,512.28 = 7,189.56/x
  3. Step 3: Cross multiply
    20,339.88x = 30,512.28 × 7,189.56
  4. Step 4: Simplify right side
    20,339.88x = 219,369,867.80
  5. Step 5: Solve for x
    x = 219,369,867.80/20,339.88
  6. Step 6: Final answer
    x = 10,785.21

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1.5x scale

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.