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Finding the Fourth Proportional to 18,929.81, 28,396.09 and 7,679.75

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Solution

The fourth proportional to 18,929.81, 28,396.09 and 7,679.75 is: 11,520.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,929.81 : 28,396.09 = 7,679.75 : x
  2. Step 2: Convert to fraction form
    18,929.81/28,396.09 = 7,679.75/x
  3. Step 3: Cross multiply
    18,929.81x = 28,396.09 × 7,679.75
  4. Step 4: Simplify right side
    18,929.81x = 218,074,872.18
  5. Step 5: Solve for x
    x = 218,074,872.18/18,929.81
  6. Step 6: Final answer
    x = 11,520.18

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1.5x scale

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.