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Finding the Fourth Proportional to 228,911.94, 315,881.31 and 128,290.50

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Solution

The fourth proportional to 228,911.94, 315,881.31 and 128,290.50 is: 177,031.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    228,911.94 : 315,881.31 = 128,290.50 : x
  2. Step 2: Convert to fraction form
    228,911.94/315,881.31 = 128,290.50/x
  3. Step 3: Cross multiply
    228,911.94x = 315,881.31 × 128,290.50
  4. Step 4: Simplify right side
    228,911.94x = 40,524,571,200.56
  5. Step 5: Solve for x
    x = 40,524,571,200.56/228,911.94
  6. Step 6: Final answer
    x = 177,031.27

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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.