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Finding the Fourth Proportional to 128,796.11, 177,747.72 and 71,453.78

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Solution

The fourth proportional to 128,796.11, 177,747.72 and 71,453.78 is: 98,611.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,796.11 : 177,747.72 = 71,453.78 : x
  2. Step 2: Convert to fraction form
    128,796.11/177,747.72 = 71,453.78/x
  3. Step 3: Cross multiply
    128,796.11x = 177,747.72 × 71,453.78
  4. Step 4: Simplify right side
    128,796.11x = 12,700,746,480.38
  5. Step 5: Solve for x
    x = 12,700,746,480.38/128,796.11
  6. Step 6: Final answer
    x = 98,611.26

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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.