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Finding the Fourth Proportional to 111,970.80, 167,729.40 and 69,721.20

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Solution

The fourth proportional to 111,970.80, 167,729.40 and 69,721.20 is: 104,440.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,970.80 : 167,729.40 = 69,721.20 : x
  2. Step 2: Convert to fraction form
    111,970.80/167,729.40 = 69,721.20/x
  3. Step 3: Cross multiply
    111,970.80x = 167,729.40 × 69,721.20
  4. Step 4: Simplify right side
    111,970.80x = 11,694,295,043.28
  5. Step 5: Solve for x
    x = 11,694,295,043.28/111,970.80
  6. Step 6: Final answer
    x = 104,440.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.