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Finding the Fourth Proportional to 128,371.54, 177,139.10 and 71,001.75

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Solution

The fourth proportional to 128,371.54, 177,139.10 and 71,001.75 is: 97,974.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,371.54 : 177,139.10 = 71,001.75 : x
  2. Step 2: Convert to fraction form
    128,371.54/177,139.10 = 71,001.75/x
  3. Step 3: Cross multiply
    128,371.54x = 177,139.10 × 71,001.75
  4. Step 4: Simplify right side
    128,371.54x = 12,577,186,093.43
  5. Step 5: Solve for x
    x = 12,577,186,093.43/128,371.54
  6. Step 6: Final answer
    x = 97,974.88

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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.