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Finding the Fourth Proportional to 102,790, 154,185 and 28,918

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Solution

The fourth proportional to 102,790, 154,185 and 28,918 is: 43,377

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,790 : 154,185 = 28,918 : x
  2. Step 2: Convert to fraction form
    102,790/154,185 = 28,918/x
  3. Step 3: Cross multiply
    102,790x = 154,185 × 28,918
  4. Step 4: Simplify right side
    102,790x = 4,458,721,830
  5. Step 5: Solve for x
    x = 4,458,721,830/102,790
  6. Step 6: Final answer
    x = 43,377

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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.