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Finding the Fourth Proportional to 18,755.80, 28,129.88 and 6,905.52

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Solution

The fourth proportional to 18,755.80, 28,129.88 and 6,905.52 is: 10,356.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,755.80 : 28,129.88 = 6,905.52 : x
  2. Step 2: Convert to fraction form
    18,755.80/28,129.88 = 6,905.52/x
  3. Step 3: Cross multiply
    18,755.80x = 28,129.88 × 6,905.52
  4. Step 4: Simplify right side
    18,755.80x = 194,251,448.94
  5. Step 5: Solve for x
    x = 194,251,448.94/18,755.80
  6. Step 6: Final answer
    x = 10,356.87

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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.