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Finding the Fourth Proportional to 128,960.52, 177,965.52 and 72,371.88

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Solution

The fourth proportional to 128,960.52, 177,965.52 and 72,371.88 is: 99,873.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,960.52 : 177,965.52 = 72,371.88 : x
  2. Step 2: Convert to fraction form
    128,960.52/177,965.52 = 72,371.88/x
  3. Step 3: Cross multiply
    128,960.52x = 177,965.52 × 72,371.88
  4. Step 4: Simplify right side
    128,960.52x = 12,879,699,257.58
  5. Step 5: Solve for x
    x = 12,879,699,257.58/128,960.52
  6. Step 6: Final answer
    x = 99,873.20

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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.