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Finding the Fourth Proportional to 128,958.72, 177,959.04 and 71,596.80

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Solution

The fourth proportional to 128,958.72, 177,959.04 and 71,596.80 is: 98,801.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,958.72 : 177,959.04 = 71,596.80 : x
  2. Step 2: Convert to fraction form
    128,958.72/177,959.04 = 71,596.80/x
  3. Step 3: Cross multiply
    128,958.72x = 177,959.04 × 71,596.80
  4. Step 4: Simplify right side
    128,958.72x = 12,741,297,795.07
  5. Step 5: Solve for x
    x = 12,741,297,795.07/128,958.72
  6. Step 6: Final answer
    x = 98,801.37

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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.