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Finding the Fourth Proportional to 18,486.72, 27,720.72 and 12,945.60

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Solution

The fourth proportional to 18,486.72, 27,720.72 and 12,945.60 is: 19,411.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,486.72 : 27,720.72 = 12,945.60 : x
  2. Step 2: Convert to fraction form
    18,486.72/27,720.72 = 12,945.60/x
  3. Step 3: Cross multiply
    18,486.72x = 27,720.72 × 12,945.60
  4. Step 4: Simplify right side
    18,486.72x = 358,861,352.83
  5. Step 5: Solve for x
    x = 358,861,352.83/18,486.72
  6. Step 6: Final answer
    x = 19,411.85

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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.