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Finding the Fourth Proportional to 128,020.72, 176,619.32 and 80,190.80

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Solution

The fourth proportional to 128,020.72, 176,619.32 and 80,190.80 is: 110,632.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,020.72 : 176,619.32 = 80,190.80 : x
  2. Step 2: Convert to fraction form
    128,020.72/176,619.32 = 80,190.80/x
  3. Step 3: Cross multiply
    128,020.72x = 176,619.32 × 80,190.80
  4. Step 4: Simplify right side
    128,020.72x = 14,163,244,566.26
  5. Step 5: Solve for x
    x = 14,163,244,566.26/128,020.72
  6. Step 6: Final answer
    x = 110,632.44

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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.