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Finding the Fourth Proportional to 128,791.92, 177,722.64 and 72,195.60

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Solution

The fourth proportional to 128,791.92, 177,722.64 and 72,195.60 is: 99,624.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,791.92 : 177,722.64 = 72,195.60 : x
  2. Step 2: Convert to fraction form
    128,791.92/177,722.64 = 72,195.60/x
  3. Step 3: Cross multiply
    128,791.92x = 177,722.64 × 72,195.60
  4. Step 4: Simplify right side
    128,791.92x = 12,830,792,628.38
  5. Step 5: Solve for x
    x = 12,830,792,628.38/128,791.92
  6. Step 6: Final answer
    x = 99,624.20

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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.