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Finding the Fourth Proportional to 228,912.44, 315,882 and 128,291

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Solution

The fourth proportional to 228,912.44, 315,882 and 128,291 is: 177,031.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    228,912.44 : 315,882 = 128,291 : x
  2. Step 2: Convert to fraction form
    228,912.44/315,882 = 128,291/x
  3. Step 3: Cross multiply
    228,912.44x = 315,882 × 128,291
  4. Step 4: Simplify right side
    228,912.44x = 40,524,817,662
  5. Step 5: Solve for x
    x = 40,524,817,662/228,912.44
  6. Step 6: Final answer
    x = 177,031.96

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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.