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Finding the Fourth Proportional to 18,877.97, 28,317.83 and 13,356

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Solution

The fourth proportional to 18,877.97, 28,317.83 and 13,356 is: 20,034.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,877.97 : 28,317.83 = 13,356 : x
  2. Step 2: Convert to fraction form
    18,877.97/28,317.83 = 13,356/x
  3. Step 3: Cross multiply
    18,877.97x = 28,317.83 × 13,356
  4. Step 4: Simplify right side
    18,877.97x = 378,212,870.70
  5. Step 5: Solve for x
    x = 378,212,870.70/18,877.97
  6. Step 6: Final answer
    x = 20,034.61

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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.