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Finding the Fourth Proportional to 18,479, 27,718.50 and 7,390.64

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Solution

The fourth proportional to 18,479, 27,718.50 and 7,390.64 is: 11,085.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,479 : 27,718.50 = 7,390.64 : x
  2. Step 2: Convert to fraction form
    18,479/27,718.50 = 7,390.64/x
  3. Step 3: Cross multiply
    18,479x = 27,718.50 × 7,390.64
  4. Step 4: Simplify right side
    18,479x = 204,857,454.84
  5. Step 5: Solve for x
    x = 204,857,454.84/18,479
  6. Step 6: Final answer
    x = 11,085.96

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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.