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Finding the Fourth Proportional to 18,810.46, 28,199.04 and 7,131.88

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Solution

The fourth proportional to 18,810.46, 28,199.04 and 7,131.88 is: 10,691.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,810.46 : 28,199.04 = 7,131.88 : x
  2. Step 2: Convert to fraction form
    18,810.46/28,199.04 = 7,131.88/x
  3. Step 3: Cross multiply
    18,810.46x = 28,199.04 × 7,131.88
  4. Step 4: Simplify right side
    18,810.46x = 201,112,169.40
  5. Step 5: Solve for x
    x = 201,112,169.40/18,810.46
  6. Step 6: Final answer
    x = 10,691.51

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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.