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Finding the Fourth Proportional to 128,628.63, 177,513.84 and 77,640.55

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Solution

The fourth proportional to 128,628.63, 177,513.84 and 77,640.55 is: 107,147.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,628.63 : 177,513.84 = 77,640.55 : x
  2. Step 2: Convert to fraction form
    128,628.63/177,513.84 = 77,640.55/x
  3. Step 3: Cross multiply
    128,628.63x = 177,513.84 × 77,640.55
  4. Step 4: Simplify right side
    128,628.63x = 13,782,271,726.43
  5. Step 5: Solve for x
    x = 13,782,271,726.43/128,628.63
  6. Step 6: Final answer
    x = 107,147.78

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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.