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Finding the Fourth Proportional to 128,834.28, 177,792.84 and 71,474.67

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Solution

The fourth proportional to 128,834.28, 177,792.84 and 71,474.67 is: 98,635.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,834.28 : 177,792.84 = 71,474.67 : x
  2. Step 2: Convert to fraction form
    128,834.28/177,792.84 = 71,474.67/x
  3. Step 3: Cross multiply
    128,834.28x = 177,792.84 × 71,474.67
  4. Step 4: Simplify right side
    128,834.28x = 12,707,684,567.36
  5. Step 5: Solve for x
    x = 12,707,684,567.36/128,834.28
  6. Step 6: Final answer
    x = 98,635.90

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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.