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Finding the Fourth Proportional to 18,718.70, 28,080.78 and 6,709.94

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Solution

The fourth proportional to 18,718.70, 28,080.78 and 6,709.94 is: 10,065.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,718.70 : 28,080.78 = 6,709.94 : x
  2. Step 2: Convert to fraction form
    18,718.70/28,080.78 = 6,709.94/x
  3. Step 3: Cross multiply
    18,718.70x = 28,080.78 × 6,709.94
  4. Step 4: Simplify right side
    18,718.70x = 188,420,348.95
  5. Step 5: Solve for x
    x = 188,420,348.95/18,718.70
  6. Step 6: Final answer
    x = 10,065.89

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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.