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Finding the Fourth Proportional to 128,711.97, 177,613.56 and 71,350.74

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Solution

The fourth proportional to 128,711.97, 177,613.56 and 71,350.74 is: 98,459.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,711.97 : 177,613.56 = 71,350.74 : x
  2. Step 2: Convert to fraction form
    128,711.97/177,613.56 = 71,350.74/x
  3. Step 3: Cross multiply
    128,711.97x = 177,613.56 × 71,350.74
  4. Step 4: Simplify right side
    128,711.97x = 12,672,858,940.03
  5. Step 5: Solve for x
    x = 12,672,858,940.03/128,711.97
  6. Step 6: Final answer
    x = 98,459.06

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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.