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Finding the Fourth Proportional to 128,845.94, 193,268.88 and 75,618.90

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Solution

The fourth proportional to 128,845.94, 193,268.88 and 75,618.90 is: 113,428.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,845.94 : 193,268.88 = 75,618.90 : x
  2. Step 2: Convert to fraction form
    128,845.94/193,268.88 = 75,618.90/x
  3. Step 3: Cross multiply
    128,845.94x = 193,268.88 × 75,618.90
  4. Step 4: Simplify right side
    128,845.94x = 14,614,780,109.83
  5. Step 5: Solve for x
    x = 14,614,780,109.83/128,845.94
  6. Step 6: Final answer
    x = 113,428.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.