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Finding the Fourth Proportional to 128,383.64, 177,166.11 and 71,021.48

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Solution

The fourth proportional to 128,383.64, 177,166.11 and 71,021.48 is: 98,007.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,383.64 : 177,166.11 = 71,021.48 : x
  2. Step 2: Convert to fraction form
    128,383.64/177,166.11 = 71,021.48/x
  3. Step 3: Cross multiply
    128,383.64x = 177,166.11 × 71,021.48
  4. Step 4: Simplify right side
    128,383.64x = 12,582,599,338.04
  5. Step 5: Solve for x
    x = 12,582,599,338.04/128,383.64
  6. Step 6: Final answer
    x = 98,007.81

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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.