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Finding the Fourth Proportional to 128,759.63, 177,696.48 and 72,171

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Solution

The fourth proportional to 128,759.63, 177,696.48 and 72,171 is: 99,600.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,759.63 : 177,696.48 = 72,171 : x
  2. Step 2: Convert to fraction form
    128,759.63/177,696.48 = 72,171/x
  3. Step 3: Cross multiply
    128,759.63x = 177,696.48 × 72,171
  4. Step 4: Simplify right side
    128,759.63x = 12,824,532,928.72
  5. Step 5: Solve for x
    x = 12,824,532,928.72/128,759.63
  6. Step 6: Final answer
    x = 99,600.58

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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.