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Finding the Fourth Proportional to 128,708.96, 177,474.48 and 80,903.84

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Solution

The fourth proportional to 128,708.96, 177,474.48 and 80,903.84 is: 111,556.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,708.96 : 177,474.48 = 80,903.84 : x
  2. Step 2: Convert to fraction form
    128,708.96/177,474.48 = 80,903.84/x
  3. Step 3: Cross multiply
    128,708.96x = 177,474.48 × 80,903.84
  4. Step 4: Simplify right side
    128,708.96x = 14,358,366,934.00
  5. Step 5: Solve for x
    x = 14,358,366,934.00/128,708.96
  6. Step 6: Final answer
    x = 111,556.86

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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.