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Finding the Fourth Proportional to 18,939.65, 28,404.74 and 7,849.40

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Solution

The fourth proportional to 18,939.65, 28,404.74 and 7,849.40 is: 11,772.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,939.65 : 28,404.74 = 7,849.40 : x
  2. Step 2: Convert to fraction form
    18,939.65/28,404.74 = 7,849.40/x
  3. Step 3: Cross multiply
    18,939.65x = 28,404.74 × 7,849.40
  4. Step 4: Simplify right side
    18,939.65x = 222,960,043.76
  5. Step 5: Solve for x
    x = 222,960,043.76/18,939.65
  6. Step 6: Final answer
    x = 11,772.13

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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.