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Finding the Fourth Proportional to 20,455.79, 30,668.90 and 7,965.27

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Solution

The fourth proportional to 20,455.79, 30,668.90 and 7,965.27 is: 11,942.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,455.79 : 30,668.90 = 7,965.27 : x
  2. Step 2: Convert to fraction form
    20,455.79/30,668.90 = 7,965.27/x
  3. Step 3: Cross multiply
    20,455.79x = 30,668.90 × 7,965.27
  4. Step 4: Simplify right side
    20,455.79x = 244,286,029.28
  5. Step 5: Solve for x
    x = 244,286,029.28/20,455.79
  6. Step 6: Final answer
    x = 11,942.15

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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.