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Finding the Fourth Proportional to 18,960.72, 28,446.54 and 5,815.02

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Solution

The fourth proportional to 18,960.72, 28,446.54 and 5,815.02 is: 8,724.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,960.72 : 28,446.54 = 5,815.02 : x
  2. Step 2: Convert to fraction form
    18,960.72/28,446.54 = 5,815.02/x
  3. Step 3: Cross multiply
    18,960.72x = 28,446.54 × 5,815.02
  4. Step 4: Simplify right side
    18,960.72x = 165,417,199.03
  5. Step 5: Solve for x
    x = 165,417,199.03/18,960.72
  6. Step 6: Final answer
    x = 8,724.20

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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.