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Finding the Fourth Proportional to 128,428.54, 177,244.72 and 73,982.60

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Solution

The fourth proportional to 128,428.54, 177,244.72 and 73,982.60 is: 102,103.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,428.54 : 177,244.72 = 73,982.60 : x
  2. Step 2: Convert to fraction form
    128,428.54/177,244.72 = 73,982.60/x
  3. Step 3: Cross multiply
    128,428.54x = 177,244.72 × 73,982.60
  4. Step 4: Simplify right side
    128,428.54x = 13,113,025,221.87
  5. Step 5: Solve for x
    x = 13,113,025,221.87/128,428.54
  6. Step 6: Final answer
    x = 102,103.67

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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.