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Finding the Fourth Proportional to 128,327.70, 177,008.79 and 82,314.52

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Solution

The fourth proportional to 128,327.70, 177,008.79 and 82,314.52 is: 113,540.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,327.70 : 177,008.79 = 82,314.52 : x
  2. Step 2: Convert to fraction form
    128,327.70/177,008.79 = 82,314.52/x
  3. Step 3: Cross multiply
    128,327.70x = 177,008.79 × 82,314.52
  4. Step 4: Simplify right side
    128,327.70x = 14,570,393,584.63
  5. Step 5: Solve for x
    x = 14,570,393,584.63/128,327.70
  6. Step 6: Final answer
    x = 113,540.52

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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.