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Finding the Fourth Proportional to 128,824.97, 177,778.52 and 78,523.97

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Solution

The fourth proportional to 128,824.97, 177,778.52 and 78,523.97 is: 108,363.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,824.97 : 177,778.52 = 78,523.97 : x
  2. Step 2: Convert to fraction form
    128,824.97/177,778.52 = 78,523.97/x
  3. Step 3: Cross multiply
    128,824.97x = 177,778.52 × 78,523.97
  4. Step 4: Simplify right side
    128,824.97x = 13,959,875,811.88
  5. Step 5: Solve for x
    x = 13,959,875,811.88/128,824.97
  6. Step 6: Final answer
    x = 108,363.12

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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.