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Finding the Fourth Proportional to 128,630.43, 177,515.46 and 74,906.79

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Solution

The fourth proportional to 128,630.43, 177,515.46 and 74,906.79 is: 103,374.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,630.43 : 177,515.46 = 74,906.79 : x
  2. Step 2: Convert to fraction form
    128,630.43/177,515.46 = 74,906.79/x
  3. Step 3: Cross multiply
    128,630.43x = 177,515.46 × 74,906.79
  4. Step 4: Simplify right side
    128,630.43x = 13,297,113,283.97
  5. Step 5: Solve for x
    x = 13,297,113,283.97/128,630.43
  6. Step 6: Final answer
    x = 103,374.55

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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.