Home / 128,517.40-177,356.37-71,928.64

Finding the Fourth Proportional to 128,517.40, 177,356.37 and 71,928.64

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Solution

The fourth proportional to 128,517.40, 177,356.37 and 71,928.64 is: 99,262.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,517.40 : 177,356.37 = 71,928.64 : x
  2. Step 2: Convert to fraction form
    128,517.40/177,356.37 = 71,928.64/x
  3. Step 3: Cross multiply
    128,517.40x = 177,356.37 × 71,928.64
  4. Step 4: Simplify right side
    128,517.40x = 12,757,002,576.27
  5. Step 5: Solve for x
    x = 12,757,002,576.27/128,517.40
  6. Step 6: Final answer
    x = 99,262.84

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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.