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Finding the Fourth Proportional to 128,604.72, 177,474.49 and 71,247.77

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Solution

The fourth proportional to 128,604.72, 177,474.49 and 71,247.77 is: 98,321.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,604.72 : 177,474.49 = 71,247.77 : x
  2. Step 2: Convert to fraction form
    128,604.72/177,474.49 = 71,247.77/x
  3. Step 3: Cross multiply
    128,604.72x = 177,474.49 × 71,247.77
  4. Step 4: Simplify right side
    128,604.72x = 12,644,661,644.39
  5. Step 5: Solve for x
    x = 12,644,661,644.39/128,604.72
  6. Step 6: Final answer
    x = 98,321.91

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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.