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Finding the Fourth Proportional to 128,629.94, 177,452.78 and 77,614.22

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Solution

The fourth proportional to 128,629.94, 177,452.78 and 77,614.22 is: 107,073.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,629.94 : 177,452.78 = 77,614.22 : x
  2. Step 2: Convert to fraction form
    128,629.94/177,452.78 = 77,614.22/x
  3. Step 3: Cross multiply
    128,629.94x = 177,452.78 × 77,614.22
  4. Step 4: Simplify right side
    128,629.94x = 13,772,858,163.92
  5. Step 5: Solve for x
    x = 13,772,858,163.92/128,629.94
  6. Step 6: Final answer
    x = 107,073.50

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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.