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Finding the Fourth Proportional to 18,767.84, 28,112 and 12,174.40

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Solution

The fourth proportional to 18,767.84, 28,112 and 12,174.40 is: 18,235.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,767.84 : 28,112 = 12,174.40 : x
  2. Step 2: Convert to fraction form
    18,767.84/28,112 = 12,174.40/x
  3. Step 3: Cross multiply
    18,767.84x = 28,112 × 12,174.40
  4. Step 4: Simplify right side
    18,767.84x = 342,246,732.80
  5. Step 5: Solve for x
    x = 342,246,732.80/18,767.84
  6. Step 6: Final answer
    x = 18,235.81

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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.