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Finding the Fourth Proportional to 20,425.58, 30,630.48 and 7,943.92

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Solution

The fourth proportional to 20,425.58, 30,630.48 and 7,943.92 is: 11,912.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,425.58 : 30,630.48 = 7,943.92 : x
  2. Step 2: Convert to fraction form
    20,425.58/30,630.48 = 7,943.92/x
  3. Step 3: Cross multiply
    20,425.58x = 30,630.48 × 7,943.92
  4. Step 4: Simplify right side
    20,425.58x = 243,326,082.68
  5. Step 5: Solve for x
    x = 243,326,082.68/20,425.58
  6. Step 6: Final answer
    x = 11,912.81

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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.