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Finding the Fourth Proportional to 128,425.94, 177,218.16 and 71,826.38

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Solution

The fourth proportional to 128,425.94, 177,218.16 and 71,826.38 is: 99,115.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,425.94 : 177,218.16 = 71,826.38 : x
  2. Step 2: Convert to fraction form
    128,425.94/177,218.16 = 71,826.38/x
  3. Step 3: Cross multiply
    128,425.94x = 177,218.16 × 71,826.38
  4. Step 4: Simplify right side
    128,425.94x = 12,728,938,016.97
  5. Step 5: Solve for x
    x = 12,728,938,016.97/128,425.94
  6. Step 6: Final answer
    x = 99,115.01

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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.