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Finding the Fourth Proportional to 128,895.87, 177,989.30 and 80,580.39

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Solution

The fourth proportional to 128,895.87, 177,989.30 and 80,580.39 is: 111,271.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,895.87 : 177,989.30 = 80,580.39 : x
  2. Step 2: Convert to fraction form
    128,895.87/177,989.30 = 80,580.39/x
  3. Step 3: Cross multiply
    128,895.87x = 177,989.30 × 80,580.39
  4. Step 4: Simplify right side
    128,895.87x = 14,342,446,806.93
  5. Step 5: Solve for x
    x = 14,342,446,806.93/128,895.87
  6. Step 6: Final answer
    x = 111,271.58

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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.