Home / 128,975.92-177,986.78-72,387.30

Finding the Fourth Proportional to 128,975.92, 177,986.78 and 72,387.30

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Solution

The fourth proportional to 128,975.92, 177,986.78 and 72,387.30 is: 99,894.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,975.92 : 177,986.78 = 72,387.30 : x
  2. Step 2: Convert to fraction form
    128,975.92/177,986.78 = 72,387.30/x
  3. Step 3: Cross multiply
    128,975.92x = 177,986.78 × 72,387.30
  4. Step 4: Simplify right side
    128,975.92x = 12,883,981,886.35
  5. Step 5: Solve for x
    x = 12,883,981,886.35/128,975.92
  6. Step 6: Final answer
    x = 99,894.47

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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.