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Finding the Fourth Proportional to 178,616, 267,843.72 and 128,486

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Solution

The fourth proportional to 178,616, 267,843.72 and 128,486 is: 192,671.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    178,616 : 267,843.72 = 128,486 : x
  2. Step 2: Convert to fraction form
    178,616/267,843.72 = 128,486/x
  3. Step 3: Cross multiply
    178,616x = 267,843.72 × 128,486
  4. Step 4: Simplify right side
    178,616x = 34,414,168,207.92
  5. Step 5: Solve for x
    x = 34,414,168,207.92/178,616
  6. Step 6: Final answer
    x = 192,671.25

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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.