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Finding the Fourth Proportional to 128,896.45, 177,837.22 and 75,143.41

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Solution

The fourth proportional to 128,896.45, 177,837.22 and 75,143.41 is: 103,674.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,896.45 : 177,837.22 = 75,143.41 : x
  2. Step 2: Convert to fraction form
    128,896.45/177,837.22 = 75,143.41/x
  3. Step 3: Cross multiply
    128,896.45x = 177,837.22 × 75,143.41
  4. Step 4: Simplify right side
    128,896.45x = 13,363,295,135.72
  5. Step 5: Solve for x
    x = 13,363,295,135.72/128,896.45
  6. Step 6: Final answer
    x = 103,674.66

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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.