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Finding the Fourth Proportional to 18,721.35, 28,081.97 and 7,625.43

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Solution

The fourth proportional to 18,721.35, 28,081.97 and 7,625.43 is: 11,438.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721.35 : 28,081.97 = 7,625.43 : x
  2. Step 2: Convert to fraction form
    18,721.35/28,081.97 = 7,625.43/x
  3. Step 3: Cross multiply
    18,721.35x = 28,081.97 × 7,625.43
  4. Step 4: Simplify right side
    18,721.35x = 214,136,917.96
  5. Step 5: Solve for x
    x = 214,136,917.96/18,721.35
  6. Step 6: Final answer
    x = 11,438.12

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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.