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Finding the Fourth Proportional to 128,020.97, 176,619.67 and 80,191.05

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Solution

The fourth proportional to 128,020.97, 176,619.67 and 80,191.05 is: 110,632.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,020.97 : 176,619.67 = 80,191.05 : x
  2. Step 2: Convert to fraction form
    128,020.97/176,619.67 = 80,191.05/x
  3. Step 3: Cross multiply
    128,020.97x = 176,619.67 × 80,191.05
  4. Step 4: Simplify right side
    128,020.97x = 14,163,316,387.00
  5. Step 5: Solve for x
    x = 14,163,316,387.00/128,020.97
  6. Step 6: Final answer
    x = 110,632.78

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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.