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Finding the Fourth Proportional to 225,619.05, 311,314.82 and 128,778.69

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Solution

The fourth proportional to 225,619.05, 311,314.82 and 128,778.69 is: 177,692.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    225,619.05 : 311,314.82 = 128,778.69 : x
  2. Step 2: Convert to fraction form
    225,619.05/311,314.82 = 128,778.69/x
  3. Step 3: Cross multiply
    225,619.05x = 311,314.82 × 128,778.69
  4. Step 4: Simplify right side
    225,619.05x = 40,090,714,053.29
  5. Step 5: Solve for x
    x = 40,090,714,053.29/225,619.05
  6. Step 6: Final answer
    x = 177,692.06

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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.