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Finding the Fourth Proportional to 18,918.12, 28,387.68 and 8,529

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Solution

The fourth proportional to 18,918.12, 28,387.68 and 8,529 is: 12,798.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.12 : 28,387.68 = 8,529 : x
  2. Step 2: Convert to fraction form
    18,918.12/28,387.68 = 8,529/x
  3. Step 3: Cross multiply
    18,918.12x = 28,387.68 × 8,529
  4. Step 4: Simplify right side
    18,918.12x = 242,118,522.72
  5. Step 5: Solve for x
    x = 242,118,522.72/18,918.12
  6. Step 6: Final answer
    x = 12,798.23

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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.