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Finding the Fourth Proportional to 128,396.89, 177,193 and 71,035.30

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Solution

The fourth proportional to 128,396.89, 177,193 and 71,035.30 is: 98,031.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,396.89 : 177,193 = 71,035.30 : x
  2. Step 2: Convert to fraction form
    128,396.89/177,193 = 71,035.30/x
  3. Step 3: Cross multiply
    128,396.89x = 177,193 × 71,035.30
  4. Step 4: Simplify right side
    128,396.89x = 12,586,957,912.90
  5. Step 5: Solve for x
    x = 12,586,957,912.90/128,396.89
  6. Step 6: Final answer
    x = 98,031.64

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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.