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Finding the Fourth Proportional to 15,945.40, 23,874.90 and 12,489.40

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Solution

The fourth proportional to 15,945.40, 23,874.90 and 12,489.40 is: 18,700.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,945.40 : 23,874.90 = 12,489.40 : x
  2. Step 2: Convert to fraction form
    15,945.40/23,874.90 = 12,489.40/x
  3. Step 3: Cross multiply
    15,945.40x = 23,874.90 × 12,489.40
  4. Step 4: Simplify right side
    15,945.40x = 298,183,176.06
  5. Step 5: Solve for x
    x = 298,183,176.06/15,945.40
  6. Step 6: Final answer
    x = 18,700.26

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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.