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Finding the Fourth Proportional to 18,933.80, 28,410.48 and 8,411.09

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Solution

The fourth proportional to 18,933.80, 28,410.48 and 8,411.09 is: 12,620.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,933.80 : 28,410.48 = 8,411.09 : x
  2. Step 2: Convert to fraction form
    18,933.80/28,410.48 = 8,411.09/x
  3. Step 3: Cross multiply
    18,933.80x = 28,410.48 × 8,411.09
  4. Step 4: Simplify right side
    18,933.80x = 238,962,962.17
  5. Step 5: Solve for x
    x = 238,962,962.17/18,933.80
  6. Step 6: Final answer
    x = 12,620.98

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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.