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Finding the Fourth Proportional to 128,119.92, 176,808.36 and 80,375.28

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Solution

The fourth proportional to 128,119.92, 176,808.36 and 80,375.28 is: 110,919.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,119.92 : 176,808.36 = 80,375.28 : x
  2. Step 2: Convert to fraction form
    128,119.92/176,808.36 = 80,375.28/x
  3. Step 3: Cross multiply
    128,119.92x = 176,808.36 × 80,375.28
  4. Step 4: Simplify right side
    128,119.92x = 14,211,021,441.34
  5. Step 5: Solve for x
    x = 14,211,021,441.34/128,119.92
  6. Step 6: Final answer
    x = 110,919.69

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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.