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Finding the Fourth Proportional to 128,675.82, 177,558.30 and 74,949.60

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Solution

The fourth proportional to 128,675.82, 177,558.30 and 74,949.60 is: 103,422.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,675.82 : 177,558.30 = 74,949.60 : x
  2. Step 2: Convert to fraction form
    128,675.82/177,558.30 = 74,949.60/x
  3. Step 3: Cross multiply
    128,675.82x = 177,558.30 × 74,949.60
  4. Step 4: Simplify right side
    128,675.82x = 13,307,923,561.68
  5. Step 5: Solve for x
    x = 13,307,923,561.68/128,675.82
  6. Step 6: Final answer
    x = 103,422.10

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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.