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Finding the Fourth Proportional to 128,425.54, 177,240.58 and 73,979.60

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Solution

The fourth proportional to 128,425.54, 177,240.58 and 73,979.60 is: 102,099.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,425.54 : 177,240.58 = 73,979.60 : x
  2. Step 2: Convert to fraction form
    128,425.54/177,240.58 = 73,979.60/x
  3. Step 3: Cross multiply
    128,425.54x = 177,240.58 × 73,979.60
  4. Step 4: Simplify right side
    128,425.54x = 13,112,187,212.17
  5. Step 5: Solve for x
    x = 13,112,187,212.17/128,425.54
  6. Step 6: Final answer
    x = 102,099.53

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1.5x scale

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.