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Finding the Fourth Proportional to 20,570.39, 30,855.56 and 7,422.74

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Solution

The fourth proportional to 20,570.39, 30,855.56 and 7,422.74 is: 11,134.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,570.39 : 30,855.56 = 7,422.74 : x
  2. Step 2: Convert to fraction form
    20,570.39/30,855.56 = 7,422.74/x
  3. Step 3: Cross multiply
    20,570.39x = 30,855.56 × 7,422.74
  4. Step 4: Simplify right side
    20,570.39x = 229,032,608.04
  5. Step 5: Solve for x
    x = 229,032,608.04/20,570.39
  6. Step 6: Final answer
    x = 11,134.09

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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.