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Finding the Fourth Proportional to 20,620.30, 30,930.43 and 7,472.65

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Solution

The fourth proportional to 20,620.30, 30,930.43 and 7,472.65 is: 11,208.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,620.30 : 30,930.43 = 7,472.65 : x
  2. Step 2: Convert to fraction form
    20,620.30/30,930.43 = 7,472.65/x
  3. Step 3: Cross multiply
    20,620.30x = 30,930.43 × 7,472.65
  4. Step 4: Simplify right side
    20,620.30x = 231,132,085.72
  5. Step 5: Solve for x
    x = 231,132,085.72/20,620.30
  6. Step 6: Final answer
    x = 11,208.96

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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.