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Finding the Fourth Proportional to 18,910.14, 28,348.74 and 7,809.90

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Solution

The fourth proportional to 18,910.14, 28,348.74 and 7,809.90 is: 11,708.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,910.14 : 28,348.74 = 7,809.90 : x
  2. Step 2: Convert to fraction form
    18,910.14/28,348.74 = 7,809.90/x
  3. Step 3: Cross multiply
    18,910.14x = 28,348.74 × 7,809.90
  4. Step 4: Simplify right side
    18,910.14x = 221,400,824.53
  5. Step 5: Solve for x
    x = 221,400,824.53/18,910.14
  6. Step 6: Final answer
    x = 11,708.05

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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.