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Finding the Fourth Proportional to 128,622, 177,498.42 and 72,033.39

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Solution

The fourth proportional to 128,622, 177,498.42 and 72,033.39 is: 99,406.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,622 : 177,498.42 = 72,033.39 : x
  2. Step 2: Convert to fraction form
    128,622/177,498.42 = 72,033.39/x
  3. Step 3: Cross multiply
    128,622x = 177,498.42 × 72,033.39
  4. Step 4: Simplify right side
    128,622x = 12,785,812,912.24
  5. Step 5: Solve for x
    x = 12,785,812,912.24/128,622
  6. Step 6: Final answer
    x = 99,406.11

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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.