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Finding the Fourth Proportional to 18,916.67, 28,375.31 and 15,397.97

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Solution

The fourth proportional to 18,916.67, 28,375.31 and 15,397.97 is: 23,097.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,916.67 : 28,375.31 = 15,397.97 : x
  2. Step 2: Convert to fraction form
    18,916.67/28,375.31 = 15,397.97/x
  3. Step 3: Cross multiply
    18,916.67x = 28,375.31 × 15,397.97
  4. Step 4: Simplify right side
    18,916.67x = 436,922,068.74
  5. Step 5: Solve for x
    x = 436,922,068.74/18,916.67
  6. Step 6: Final answer
    x = 23,097.19

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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.