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Finding the Fourth Proportional to 18,954.60, 28,435.20 and 7,855.20

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Solution

The fourth proportional to 18,954.60, 28,435.20 and 7,855.20 is: 11,784.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,954.60 : 28,435.20 = 7,855.20 : x
  2. Step 2: Convert to fraction form
    18,954.60/28,435.20 = 7,855.20/x
  3. Step 3: Cross multiply
    18,954.60x = 28,435.20 × 7,855.20
  4. Step 4: Simplify right side
    18,954.60x = 223,364,183.04
  5. Step 5: Solve for x
    x = 223,364,183.04/18,954.60
  6. Step 6: Final answer
    x = 11,784.17

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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.