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Finding the Fourth Proportional to 18,873.36, 28,287.36 and 13,318.38

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Solution

The fourth proportional to 18,873.36, 28,287.36 and 13,318.38 is: 19,961.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,873.36 : 28,287.36 = 13,318.38 : x
  2. Step 2: Convert to fraction form
    18,873.36/28,287.36 = 13,318.38/x
  3. Step 3: Cross multiply
    18,873.36x = 28,287.36 × 13,318.38
  4. Step 4: Simplify right side
    18,873.36x = 376,741,809.68
  5. Step 5: Solve for x
    x = 376,741,809.68/18,873.36
  6. Step 6: Final answer
    x = 19,961.57

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1.5x scale

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.