Home / 128,979.81-177,982.38-72,380.25

Finding the Fourth Proportional to 128,979.81, 177,982.38 and 72,380.25

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Solution

The fourth proportional to 128,979.81, 177,982.38 and 72,380.25 is: 99,879.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,979.81 : 177,982.38 = 72,380.25 : x
  2. Step 2: Convert to fraction form
    128,979.81/177,982.38 = 72,380.25/x
  3. Step 3: Cross multiply
    128,979.81x = 177,982.38 × 72,380.25
  4. Step 4: Simplify right side
    128,979.81x = 12,882,409,160.00
  5. Step 5: Solve for x
    x = 12,882,409,160.00/128,979.81
  6. Step 6: Final answer
    x = 99,879.27

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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.