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Finding the Fourth Proportional to 128,850.75, 177,833.48 and 78,578.91

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Solution

The fourth proportional to 128,850.75, 177,833.48 and 78,578.91 is: 108,450.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,850.75 : 177,833.48 = 78,578.91 : x
  2. Step 2: Convert to fraction form
    128,850.75/177,833.48 = 78,578.91/x
  3. Step 3: Cross multiply
    128,850.75x = 177,833.48 × 78,578.91
  4. Step 4: Simplify right side
    128,850.75x = 13,973,960,627.01
  5. Step 5: Solve for x
    x = 13,973,960,627.01/128,850.75
  6. Step 6: Final answer
    x = 108,450.75

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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.