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Finding the Fourth Proportional to 20,392.68, 30,597.56 and 7,921.40

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Solution

The fourth proportional to 20,392.68, 30,597.56 and 7,921.40 is: 11,885.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,392.68 : 30,597.56 = 7,921.40 : x
  2. Step 2: Convert to fraction form
    20,392.68/30,597.56 = 7,921.40/x
  3. Step 3: Cross multiply
    20,392.68x = 30,597.56 × 7,921.40
  4. Step 4: Simplify right side
    20,392.68x = 242,375,511.78
  5. Step 5: Solve for x
    x = 242,375,511.78/20,392.68
  6. Step 6: Final answer
    x = 11,885.42

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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.