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Finding the Fourth Proportional to 18,698.80, 28,039.99 and 7,003.82

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Solution

The fourth proportional to 18,698.80, 28,039.99 and 7,003.82 is: 10,502.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,698.80 : 28,039.99 = 7,003.82 : x
  2. Step 2: Convert to fraction form
    18,698.80/28,039.99 = 7,003.82/x
  3. Step 3: Cross multiply
    18,698.80x = 28,039.99 × 7,003.82
  4. Step 4: Simplify right side
    18,698.80x = 196,387,042.76
  5. Step 5: Solve for x
    x = 196,387,042.76/18,698.80
  6. Step 6: Final answer
    x = 10,502.65

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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.