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Finding the Fourth Proportional to 18,640.86, 25,715.79 and 11,923.13

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Solution

The fourth proportional to 18,640.86, 25,715.79 and 11,923.13 is: 16,448.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,640.86 : 25,715.79 = 11,923.13 : x
  2. Step 2: Convert to fraction form
    18,640.86/25,715.79 = 11,923.13/x
  3. Step 3: Cross multiply
    18,640.86x = 25,715.79 × 11,923.13
  4. Step 4: Simplify right side
    18,640.86x = 306,612,578.64
  5. Step 5: Solve for x
    x = 306,612,578.64/18,640.86
  6. Step 6: Final answer
    x = 16,448.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.