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Finding the Fourth Proportional to 118,963.80, 164,121.72 and 81,172.44

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Solution

The fourth proportional to 118,963.80, 164,121.72 and 81,172.44 is: 111,984.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,963.80 : 164,121.72 = 81,172.44 : x
  2. Step 2: Convert to fraction form
    118,963.80/164,121.72 = 81,172.44/x
  3. Step 3: Cross multiply
    118,963.80x = 164,121.72 × 81,172.44
  4. Step 4: Simplify right side
    118,963.80x = 13,322,160,469.40
  5. Step 5: Solve for x
    x = 13,322,160,469.40/118,963.80
  6. Step 6: Final answer
    x = 111,984.99

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1.5x scale

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.