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Finding the Fourth Proportional to 18,721.94, 28,081.08 and 7,628.99

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Solution

The fourth proportional to 18,721.94, 28,081.08 and 7,628.99 is: 11,442.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721.94 : 28,081.08 = 7,628.99 : x
  2. Step 2: Convert to fraction form
    18,721.94/28,081.08 = 7,628.99/x
  3. Step 3: Cross multiply
    18,721.94x = 28,081.08 × 7,628.99
  4. Step 4: Simplify right side
    18,721.94x = 214,230,138.10
  5. Step 5: Solve for x
    x = 214,230,138.10/18,721.94
  6. Step 6: Final answer
    x = 11,442.73

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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.