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Finding the Fourth Proportional to 128,390.67, 177,187.77 and 71,802

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Solution

The fourth proportional to 128,390.67, 177,187.77 and 71,802 is: 99,091.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,390.67 : 177,187.77 = 71,802 : x
  2. Step 2: Convert to fraction form
    128,390.67/177,187.77 = 71,802/x
  3. Step 3: Cross multiply
    128,390.67x = 177,187.77 × 71,802
  4. Step 4: Simplify right side
    128,390.67x = 12,722,436,261.54
  5. Step 5: Solve for x
    x = 12,722,436,261.54/128,390.67
  6. Step 6: Final answer
    x = 99,091.59

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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.