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Finding the Fourth Proportional to 128,620.92, 177,492.72 and 71,257.88

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Solution

The fourth proportional to 128,620.92, 177,492.72 and 71,257.88 is: 98,333.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,620.92 : 177,492.72 = 71,257.88 : x
  2. Step 2: Convert to fraction form
    128,620.92/177,492.72 = 71,257.88/x
  3. Step 3: Cross multiply
    128,620.92x = 177,492.72 × 71,257.88
  4. Step 4: Simplify right side
    128,620.92x = 12,647,754,942.63
  5. Step 5: Solve for x
    x = 12,647,754,942.63/128,620.92
  6. Step 6: Final answer
    x = 98,333.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.