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Finding the Fourth Proportional to 149,031.49, 205,660.60 and 81,963.49

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Solution

The fourth proportional to 149,031.49, 205,660.60 and 81,963.49 is: 113,108.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    149,031.49 : 205,660.60 = 81,963.49 : x
  2. Step 2: Convert to fraction form
    149,031.49/205,660.60 = 81,963.49/x
  3. Step 3: Cross multiply
    149,031.49x = 205,660.60 × 81,963.49
  4. Step 4: Simplify right side
    149,031.49x = 16,856,660,531.49
  5. Step 5: Solve for x
    x = 16,856,660,531.49/149,031.49
  6. Step 6: Final answer
    x = 113,108.05

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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.